FAQs about Convict/Engineer
Blenny/Eel/Gobies who aren't, Family
Pholidichthyidae
Related Articles: Convict Blennies,
Related FAQs: .
Who's that peering up from rocks?
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Engineer Goby 7/10/17
Hello everyone...
<Hey Mich>
Have been searching around- but there are no answers to my curiosity that I can
find:
Engineer Goby [ convict blenny ] :
What determines the difference in color - between having one that is
black/golden yellow- and one that is black/white - as it matures into
adulthood?
<Mmm; don't know. Have seen both in the wild... ALL are the same in a group
as individuals or adults>
Is there a way to pick a color? Is the color indicative of the
sex of the goby?
<I don't think so; no. Perhaps a matter of nutrition>
Or does it actually change from the black/yellow markings
to the black with white markings AS it matures further?
<Doesn't change as far as I'm aware in the wild. Ones in captivity usually
do lose golden highlights with time, growth though>
I have had a baby in the past- that grew older and the markings were the
beautiful black/yellow-gold - however - I would really love to have one
that is black and white- and going crazy trying to find SOMETHING on how
this color change happens- there has to be something in the books
somewhere
in the world, Haha - because when searching online/ and on YouTube- there
are both color versions out there.. just no explanation as to how to
choose
one that will transform into the black/white...
<Mmm; I worked on a question of color (in a local damsel, the Garibaldi)
and role of some of the algae this fish cultures in its territory... in the
seventies. Am very sure there are pertinent scientific papers on this
topic, though not necessarily with Engineer Gobies>
Nothing on Google, YouTube, fish books- and nothing that I can locate here
on WWM - can you offer any type of info on this please - thank you :)
unless.. it's just a roll of the dice, lol and nature likes to surprise
you
after you place them in your tank Haha
--
*'Chelle*
<Let me refer you here: http://www.wetwebmedia.com/litsrchart.htm
Time to expand your horizons... with the help of a college library,
reference aid. Bob Fenner>
Convict Blenny question 8/9/16
Hi there,
I recently got a medium sized adult convict goby/blenny
<Mmm; how big? And this is a social species....>
at the LFS. I have a 200G with a 40G sump. I know this is a social species, but
bought him as he was the only one they had. I'm wondering if I should add
another?
<Yes; let's have you read here:
http://www.wetwebmedia.com/pholodichthyidae.htm
and the linked FAQs file above. Bob Fenner>
I would like to, but am not sure if there would be too much fighting.
Thanks for your help.
Michael
Re: Convict Blenny question
8/10/16
Hi Bob thanks for your reply,
The convict blenny is about 6 inches in size.
<Ahh; have seen more than three times this standard length... in the wild and
captivity. Neat animals!>
I've seen a bunch of small juveniles at local fish stores, but was interested in
this one because I have a Hawkfish that has been a brute to gobies in the past.
(He has left this fish alone so far).
<Ahh>
I'm thinking that those small 2-3 inch ones would be too small for a companion
for the convict that I have, and risk them
getting picked on by my hawk.
<Actually... Pholodichthys are remarkably peaceful; including to smaller members
of their own species. If it weren't for that Cirrhitid....>
I'm thinking of ordering two more online that would be around 4-5 inches (the
largest I can find).
<Sounds good>
Thanks for the help again.
<Certainly welcome. Bob Fenner>
Convict Blenny & Blue Spotted Jawfish
7/22/14
Hi there! Hope everything is well with you today! Okay so lets get right
into it. First of all, for some reason 2 things have alluded me over the
years….. one is that the Convict Blenny has been known to eat other fish
<This is so.. and Pholodichthys can get quite large>
….. yeah………. and TWO, that Blue Spotted Jawfish are cold water fish
<Yes>
(although I DID know about the Catalina Goby!). So here I am, wondering
WHY the temperature requirements stated for the BSJ are not shown as 55
to 72˚F, since this is so important!
<Shown by whom? It is clearly stated that this is a non-tropical fish in
EVERYTHING I have written about it; on WWM and elsewhere>
Here I sit, pouring over information, kicking myself for making just a
NOOB mistake, when well, I am not a noob! I guess we all make dumb
mistakes in the hobby as the years go on! First things first….. the
Convict Blenny (Engineer Goby) AND the subadult 5-6”
<Mmm; actually; this is about it size-wise for this species>
BSJ occupy; and peacefully I may add, the same dug out area of my 75
gallon tank. They will both be peeping out of 2 different holes at the
same time and the BSJ does not even FLINCH. (right now the BSJ has taken
over the CB hole and the CB doesn’t care… yeah he texted me, its all
good!
<Heeeeee!>
lol The BSJ is so bold that he will go after my Flame Angelfish when the
flame starts his normal “I am king of the lab…. uh I mean TANK” wiggle!
It is funny that the BSJ is the ONLY fish not intimidated by the flame!
So I lowered my temperature to 78˚F, however I did it overnight with
fans, so it was not instant, and I plan to drop it to 76˚F come fall. We
are in Las Vegas, so heat is a bit of an issue. (although I wonder if I
have that much time!) I am, however, in the meantime, really worried
about all the things I am reading! The BSJ does eat well and I spot feed
him several times a day (although when I lowered the temperature from
82˚F, he is not eating as much…. I assume metabolism is slower or that
rather large chunk of Selcon soaked Krill yesterday?) and he looks
healthy, not thin, no white spots or whatever is the pre-dreaded BSJ
disease starts with..….. yet…. :( …..When everyone is eating, he is
happy to swim about the tank for quite a while then settle back into
this “den” and LOVES…. now this is a weird one….. LOVES putting his head
into the end of the bubbler tube where the air comes out!!! The tank is
completely sealed BTW because I lost one to “egg crate” which didn’t
work!
<Ah, no... Opisthognathids can/will escape from small openings>
I did add some crushed up shells which he used a few of them, but just
for his “hole” entrance. Here are a few of my questions. First, will the
Convict Blenny become a threat to my BSJ?
<Possibly>
AS in EAT him some day…. the CB is only 6 to 8” right now. My royal
Gramma has even gone into their “den” and emerged on his own, not
because he is being chased. It all seems odd to me as this behavior and
lack of fear is so opposite of what I read. My other fish/etc: 3 Large
Tongan Nassarius Snails, Large Cleaner Shrimp (wondering if someone … CB
or BSJ will eat him someday),
<Actually; the other way around. Stenopus are fish eaters when large,
can get their claws on such>
Solar Fairy Wrasse, Filamented Flasher Wrasse (yes those two are an
ongoing experiment…. mix up the rock when I do a water change and they
seem okay, it’s been 4 months with no death or nipped fins so far),
Royal Gramma, Cleaner Wrasse (Had him 4 months… eats my arm and Mysis
shrimp… impulse buy with the Flame Angelfish), a very DUMB tank bred
Platinum Percula who likes to host the skimmer tube, and one Picasso
Clownfish (estranged female from the Platinum….. I think she is in love
with the BSJ…. hosting a rock by his entrance… lol jk). Corals are
Frogspawn, Green Star Polyps and some lame Palythoas. Sand is not super
fine, but average.
Besides possibly buying a chiller for my BSJ, what is the highest temp
they can tolerate.
<Can reach into the seventies F... but will live much shortened life>
What is DONE TO THE BODY of a cool water fish. Does the warm water
suppress the immunity and cause illness?
<Mmm; take the time... and search for a function curve for proteins...
as a matter of... temperature I guess; but these have been generated for
other variables as well... there's a "curve" that you'll recognize for
"optimal" point; a range from there that drops off on either side of the
scale for the variable measure... Heated up animals can often thermally
accommodate up to points; but do suffer for being under and over-heated>
If there isn’t anything in the tank, I am hoping he just won’t GET ill
if this is the case. Or is the BSJ disease actually the body’s response
to warm water?
<To some extent; first and second order>
As in a complete break down of the endocrine systems or something
similar?
<This and the CNS are definitely involved; as are simple overall
protein, cellular physiological functions... 1/2mV squared... kinetic
energy (temperature) speeds up all rates of reaction>
Should I remove the Convict Blenny?
<Eh! See WWM re the species>
I really appreciate your insight. While I could just SELL The BSJ, I
would have to insist the person has a cool water tank. What temperature
could both those fish AND the BSJ co-exist in if I buy a chiller?
<Barely overlap thermally... low seventies F would be a near median
value>
I feel obligated to make this BSJ life long and happy…. how long would
that be?
<Most only live a few months in warm settings; a few for years.
Rosenblatt's Jawfish is a current darling/fave in a few public aquarium
institutions... most kept chilled>
lol Thanks so much for all your answers and sorry if you had to read
through this several times….. I had a lot of questions. Take care!!!!
<And you, Bob Fenner>
Can't/won't respond to this mess <below>
> Subject: Convict Blenny & Blue Spotted Jawfish
7/22/14
> Hi there! Hope everything is well with you today! Okay so lets get
right into it. First of all, for some reason 2 things have alluded me
over the years….. one is that the Convict Blenny has been known to eat
other fish
> <This is so.. and Pholodichthys can get quite large>
> ….. yeah………. and TWO, that Blue Spotted Jawfish are cold water fish
> <Yes>
> (although I DID know about the Catalina Goby!). So here I am,
wondering WHY the temperature requirements stated for the BSJ are not
shown as 55 to 72˚F, since this is so important!
> <Shown by whom? It is clearly stated that this is a non-tropical fish
in EVERYTHING I have written about it; on WWM and elsewhere>
http://www.liveaquaria.com/product/prod_display.cfm?c=747+871+748&pcatid=748
shown here… well ONE of many places. As I read, most people assume they
are fine at 76 to 78.
Re: Convict Blenny & Blue Spotted Jawfish..............
7/22/14
um, okay…. just having a conversation, you left many unanswered
questions and I thought what you had to say was interesting and I was
just posing other points of view and curiosity. Sorry that you are
having a bad day. Hope it gets better for you :)
<Am having a fab day; just don't like to sort through messy corr. Please
write out your comments if you want to communicate.
B>
Pholidichthys leucotaenia Jumpers? 1/9/14
Greetings!
<Salud Joe>
Thanks so much for Wet Web Media as well as all of the great
publications!
I have all of the Fenner, Calfo, Calfo & Fenner books and they are all
quite worn (my Conscientious Aquarist is a sad site indeed). Still
waiting eagerly on Volume 2 of the reef series but have heard that as of
now it's a no go.
<On its way someday>
Just wanted to check my fish stocking list with you if you have a brief
minute. Tank is a 6 foot 155 gallon in-wall reef set up that was
established in August with 55 gallon sump with 5" DSB refugium as well
as a mud refugium built in. Mostly going well so far minus the usual
kinks involved with a set-up like this.
For fish stocking, I have only 3 so far from the previous tank: Small
Midas Blenny, tank-bred adult Clarkii Clown, and small Royal Gramma.
Have seen quite vicious versions of all of these fishes but these (for
now) are all quite docile.
In addition to these, how does this stocking list look?
5-7 Chromis (have not decided on species)
Powder Brown Tang (japonicus sp.)
Pacific Blue Tang
Watchman Goby
Leopard Wrasse
2 Convict Blennies
Variety of Cleaner Shrimp
<Mighty fine; though I might add another Convict... more interesting,
secure in groups>
Would very much like to add a few Heniochus diphreutes but have been
searching for years without luck. I've probably seen them in the LFS but
neither I nor the folks there are able to discern the difference between
them and H. acuminatus
<Common problem in both ID and relative availability>
The main issue that I'm concerned with is the Convict Blennies. I
cemented all rock work with the Marco Rocks cement product, followed by
adding the aragonite. I don't think that burrowing will effect the rock
structure, although I only added about 3/4" of sand as to keep it in an
aerobic state.
<Okay>
I currently have 3 lids, each with a 10" x 6" square cut out in the
middle.
These were cut for improved light penetration as well as enhancing the
shimmer of the Kessil LED's. I noticed that when water gathered on the
bottom of the lid, the shimmer effect was eliminated.
Is there a chance that, pardon the pun, the convicts will escape from
these opening? Wasn't sure if their similarity to eels carried on into
this aspect. I'm fairly certain the openings will not be an issue for
the remaining live stock.
Thank you so much!!
Joe
<There is some possibility... but a system this size, the amount of
tunnel-cover, I think you won't have jumping issues. Bob Fenner>
Injured goby... no info. 7/5/13
Hi Crew. I have an Engineer Goby that is 10-11 years old. About 4
months ago we noticed that his color had become very dusky and dull and
his behavior was a little off. He frequently came out into the
open for extended periods of time, which was very unlike him, and he
started eating less. I have been able to find very little
information about the life
expectancy of the engineer gobies,
<Have been known to exceed twenty years>
nor have I been able to find much about changes that come with aging.
We watched him carefully and about a month ago his color improved and
his behavior moved back toward normal. Last week, however, he
started having difficulty controlling himself when swimming in 'open
water' and he has been laying along the front of the base rocks to keep
himself from floating away. He spent 7/2, 7/3 and 7/4 under a base
rock (which is normal behavior for him), and this morning was out in the
front open area of the tank. He has an open and raw area
on the top of his back that is about an inch long.
<And the caudal/tail is damaged, chewed possibly>
I don't see the other fish bothering him,
<... what are these other fishes, what re water quality tests, gear/set
up, foods feeding...>
so I can only assume that it is related to staying under/laying along the
rocks with increased frequency. He is laying on the sand in the
corner of the tank with the back half of his body floating upward.
(Photo attached - looks like his eye is gone, but it's just a bad
picture!) Planning to get the quarantine tank up and running and try to
get him moved today, but I'm wondering if you have any other thoughts,
information or suggestions.
Many thanks! Susan
<You should provide data; have you read on WWM re Pholidichthys? Bob
Fenner>
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Engineer Gobies - how many is too many?
5/21/13
HI Bob (or crew), hope you're well! My 200G 5' FOWLR tank
currently has 2 very large Volitans lions, a harlequin tusk, a red Coris
wrasse, and a large (12") engineer goby. I see that a teacher in a
nearby school is looking to place 6 small engineer gobies,
to shut down her small saltwater tank.
These fish are now about 4". I've thought I might take these in and grow
them to size in my 30G (currently empty) aquarium, then transfer to my
larger tank.
<Sounds good>
Would you attempt this?
<Yes I would>
Is this too much of an engineer crowd for a 200G to sustain?
<Mmm, no... the adults are secretive as you know... live communally... I
think it would be many years before they were too much>
The current goby seems to have cleaned out all sand from the existing
rockwork, and seems happy to be a loner, but I've wanted to increase the
tank's headcount anyway...
<The solitary animal will be glad of the company. Bob Fenner>
Re: Engineer Gobies - how many is too many?
6/1/13
Hi Bob...per prior email...update on the Engineers...
I rehomed all 6 into the 30G as planned. previously they were placed in
pairs in separate 10G tanks. Now I see that 3 of the six, particularly
the larger ones, have significant battle wounds. Shredded fins and
blotches.
<Patience; move them>
There are several possibilities here. I have not observed any communal
raucous whatsoever, although a) I haven't watched all hours of day and
night and b) yes, as expected, they do spend more time hidden than out
and about. There could be one renegade (or perhaps more infighting).
They have mostly taken up residence within a large piece of live rock. I
also have 3 peppermint shrimp in the tank, and there may be an unknown
live rock hitchhiker causing the carnage as well.
<Likely bickering amongst themselves. This will abate on its own>
I have watched them go from bad to worse. I have considered that I would
move the peppermints and one or two of the largest ~6" gobies (and
therefore the worse beat up) into my display. There will be perils there
as well - the 12" engineer (who could finish them quick if it doesn't
want neighbors), the volitans (probably won't get to them, so long as I
distract them when I place the engineers).
<Mmm>
Or maybe I should add them all to the display?
<Yes I would>
Is it possible the large engineer would more readily "adopt" a brood of
youngsters? Seems I have increased risk of losing some to lions in this
regard? Any thought on a plan?
<The Lions will likely recognize them as venomous, unpalatable. Have
only "seen" one incident to the contrary. The larger will likely ignore
them.
Bob Fenner would move all at once>
LR Hitchhikers in QT - OK to transfer to FOWLR display? and engineer
gobys
6/1/13
Bob,
<Big D>
Based on my emailing with the Engineers, I've decided to transfer all
life from my smaller tank to my display tank. Why not combine
households...
<Mmm, well, the Lions may well inhale the shrimp>
There are a few hitchhikers I wonder if I should have worries about with
this move. They are the stinging celled specimens in the pictures (which
I am having difficulty getting a positive ID for, based on WWM and
Google pictures), and also a hairy gorilla crab.
<... the polyps... some sort of stony coral... May be a single
Caryophylliid. See WWM re>
They will move, with the engineer gobies and peppermint shrimp (aka
lunch),
to my FOWLR display which has - 2 large volitans lions, a large
harlequin tusk, a medium red Coris wrasse. A Rabbitfish and trigger will
be added later.
<The Labrids will definitely consume the shrimp>
Should I worry that these hitchhikers will threaten my fish or otherwise
become nuisances?
<Mmm, no. BobF>
Thanks for your opinion, Dave
Ask the crew a question 10/8/12
Hi, can you please help me to identify this Marine fish?? It is about 10
inches long and about 3/8 inch thick. Sorry about the picture quality
<Mmm, is this a viviparous blenny? An eelpout? Where did you, or other
collect this fish? Bob Fenner>
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Re: Ask the crew a question, Not Blenny ID
10/9/12
I don't think it is a Viviparous Blenny. I bought it in Australia
<Mmm, there are eelpouts/Zoarcids in Australia though... perhaps a
blennioid>
and they called it a Reef Eel, which it obviously is not.
<Correct; not an anguilliform; has rayed fins>
The closest fish that resembles mine (that I can find) is a Pholidichthys
leucotaenia but I thought they all had markings and mine doesn't. Have you
ever seen a Pholidichthys that doesn't have markings??
<Never... this monotypic genus, family always has appeared the same to me...
Whoops! Just looked on Fishbase.org and there IS a second species:
http://www.fishbase.org/summary/Pholidichthys-anguis.html
Does appear similar, IS found in N. Australian waters... is this your fish?
Bob Fenner>
Re: Ask the crew a question, not blenny ID
10/10/12
I did see that species when I was doing the research on the leucotaenia,
originally I thought it probably wasn't my fish, but am now starting to
think it might be. Why do you think they have no pictures of this species
and/ or a common name for it?
<Unlike its congener it's quite rare... I've never seen it>
Also they don't mention what colour it should be.
<You may have to "run down" the original description/paper... linked on
Fishbase...>
Do I have one of the worlds newest and rarest species of Aquarium safe
fish?
<Could be>
Or it more likely Australians are too lazy to finish their work?
<Mmm, unlikely... Cheers, Bob Fenner>
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Engineer Goby tailing my clown fish
5/12/2011
Hi
<Mona>
I have a Red Sea Max 250 (60g.) saltwater tank. I have live rock, some
corals, 1 six line wrasse, 2 clown fish, 2 engineer gobies,
<Pholodichthys? Get much too large for this setting>
2 spotted cardinal fish and 1 royal gramma. I also have some snails, a
tuxedo urchin and some crabs and hermit crabs.
<What species are these crustaceans? See WWM re their
compatibility>
My tank is about 3 months old.
I had bought the ocellaris clown fish as my first fish. They were a
wonderful couple and got along well. Even though they were both the
same size. Then due to a dead slug (or so I believe), one of them died.
I bought a replacement partner and my 7 year old insisted on a black
ocellaris. At the pet store, I saw engineer gobies and fell in
love.
<A really neat species; a fave of mine... but grow to more than 18
inches...>
I know that my tank is smaller than their requirements, but they are
still small and maybe I can upgrade when needed. Honestly, I just
didn't know they needed a larger tank when I bought them.
One of the engineer gobies is hiding just like the description of the
fish states. I actually barely ever see it, except when I catch a
glimpse of it under the rocks in one of the many caves I created. The
other one is acting oblivious to the fact 1. that it should be
borrowing, it is swimming like a regular fish 2. that there is another
engineer goby in the tank 3. and it seems to think it is a clownfish,
because it is tailing the clown fishes all the time!!!! Is this normal
behavior? I keep thinking that it has mistaken the black Ocellaris for
another goby???
<Interesting speculation>
The clown fish both seem to be a bit annoyed by their stalker. What
should I do?
<Like most adolescent behaviors of humans, indulge this fish for
now... will likely "grow out of it" in time (months)>
Thank you very much in advance.
Mona
<Welcome! Bob Fenner>
Re: Crew@wetwebmedia.com, Plotosid, nee Pholodichthyid?
5/12/2011
Hello,
<Mona... a fave island (Monkey)...>
I am sorry for writing to you before you even responded to the first
email, but I have been looking every where for a good reason why my
engineer goby is tailing the clown fish. I think I might have found the
reason. Is it possible that this engineer goby is not really an
engineer goby and is a Plotosid catfish?
<Mmm, still odd to "tail" other fishes, but yes, would be
much more "out and about">
I read in one of the FAQ about the catfish that it might hit the other
fish with its head while giving them a small dosage of the venom.
<Rare>
I looked closely on the pictures online and the difference I see is
that this fish really has a catfish-mouth!
<Ahh>
I have meanwhile put it in a floating separate tank in the tank and I
plan to take it back to the fish store and give them a piece of my mind
for selling me the wrong item (I carry much of the blame, because I did
not notice the mouth earlier).
<Are very similar in appearance...>
The poor clown fish have endured enough pain!
They seem much happier since I isolated the fish.
Let me know if you think I am on the right track of thinking before I
subject the fish to any more stress than I already have! (Bagging it
and driving it to the store. I hope it survives the night in this
confined space).
<Do take care not to get poked by the spiny portion of the pectoral
fins>
Thanks again
Mona
<Again, welcome. BobF>
Re: Crew@wetwebmedia.com.
Eng. Goby, Cat? 5/12/11
turns out I got a catfish!
<Oh!>
Pet store apologized as soon as they saw it and replaced it with
engineer goby.
Thanks
Mona
<Thank you for this follow-up Mona! BobF>
Engineer Goby on the Prowl -- 02/02/11
Hello Crew!
<Hey Sus>
I am in need of emergency advise! I have a 180 gallon live rock with
fish marine system. My livestock includes:
Keyhole Angel - in the system for 6 years
Yellow Tail Damsel - in the system for 6 years
Pink Skunk Clown - in the system for 6 years
Pajama Cardinal - in the system for 4 years
Yellow Tang - in the system about 3 years
Eye Stripe Tang - in the system about 5 years
Sailfin Tang - in the system about 4 years
3 Engineer Gobies - oldest has been in the system >10 years, the
other two for about 4 years (they were introduced to the system at the
same time).
<Neat animals... I imagine your are quite large by now>
We generally have no aggression problems within the system. We had 4
Gobies until about a year ago. Three of them hung together and one
always hung by himself under a rock in the corner of the tank. Out of
the blue one morning, one of the threesome was all beat up and the old
Goby was relentlessly aggressive to the point that we had to move the
injured fish to quarantine. He did not make it. At that time we thought
that perhaps he was sick and the others were chasing him away because
of the illness.
<Mmm, yes... this is an interesting species behavior-wise... see the
Net, perhaps there is some video of how they and their young make their
lives>
The little Goby that hangs by himself has always been a little
skittish, almost afraid of his shadow to the point that he pokes his
head out from under the rock far enough to grab a little food and
that's all we see of him.
<Really needs to be in a separate system>
Yesterday he spent hours swimming around the front of the tank. We
finally saw the big/old Goby charging at him as he swam by, and we also
saw him chase him out from under the rock that has been his home for
the last few years. Last time we checked on him last night, there was
no sign of any serious physical altercation.
Today, the old Goby was still harassing the little Goby a little bit,
but he was REALLY going after the Sailfin Tang. The Sailfin usually
swims openly and freely around the tank with the other two tangs, but
spent most of the day 'cowering' behind the rock. No matter
where he went, the old Goby was almost as relentless as he had been
yesterday toward the other Goby. I did not see anyone actually doing it
today, but at some point since yesterday, someone made quite a meal of
the sailfin's fins. They are all chewed up.
<Time for a much larger tank...>
(About 6 months ago, we lost two Pajama Cardinals. One died in the main
tank before we could get him into quarantine, and the other died in the
acclimation bucket on his way to the quarantine tank. They had the same
problems with fin chewing...these also more or less appeared overnight.
We assumed that the other Pajama Cardinal was responsible, but now I am
not so sure...)
<Could be>
So I guess I have a few questions about this. Why in the world would
fish that have been living together for so long suddenly turn on each
other?
<Growth, change...>
Is it normal for an Engineer Goby to attach a Tang?
<Attack? Not really, but as stated... Pholodichthys gets quite
large, and can/does become territorial...>
Other than removing the aggressive fish, any suggestions?
<The bigger world>
(Because of the way they get under the base rocks, removing a healthy
Goby from the main tank in a process of about 8 hours total. It
requires removal of almost all of my live rock, and then restacking it
all back into the tank...)
Thanks for any thoughts you might have!
Susan
<Welcome. Bob Fenner>
Engineer Goby, sys. 1/23/11
I am breaking down my 115 gallon tank and am thinking of keeping my
engineer goby. Would it be okay in a 44 gallon tank?
<If fed... likely so>
It currently resides under a rock pile that measures about 18 x 21
inches.
The engineer goby I'm guessing is about 10 inches long, I've
never seen it all the way out of it's rock pile. I've been
trying to find a home for it, but reefkeepeers don't seem to want
it because of fear of digging and I really would like to keep it.
Thanks,
Melaine
<Would/will be a nice companion/pet. Bob Fenner>
Moray identification... Pholodichthys
12/27/10
Hi:
<Howsit?>
Have a look and help me please. This guy (gal?) is new and
reportedly from the "western Pacific".
<Mmm, is>
Bar count is lower than for E. polyzona, but none of the online
images for G. rueppellii match even closely.
<Nope>
What you can't see in the photo are well defined very fine
dorsal spines that yield a serrated edge along its entire length.
I've got to start a diet soon and assume from the rounded
snout its a crustacean eater. Any
help is appreciated.
JZ
<See here: http://wetwebmedia.com/pholodichthyidae.htm
Bob Fenner>
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Re: Moray identification
12/28/10
Wow
<Heeee~!>
LFS gave this to wife as an 'eel" for a small specimen
tank the day after x-mas.
<Mmm, well, not a true eel, nor goby or blenny for that
matter...>
My 11 year old son said "hey...I think its one of those snake
gobies we had a long time ago" (he meant at least five years
ago!).
<Dang!>
I said that I would look for some juvenile photos of potential
morays. Looks like I have a budding ichthyologist.
<Do get him interested in finance, accounting, marketing... at
least as a double major!>
We'll go back to see if they have a few more of these
"eels" and we'll move them all to the large reef
display.
<Good... is a VERY social species as you've read>
Maybe they can order a juvenile moray for us as this is what he
really wanted.
<Ahh!>
Thanks for the timely help.
JZ
<Certainly welcome. BobF> |
Engineering Gobies fighting, sys.,
stkg. 6/13/10
Hi guys,
<Howdy Harry>
First up, your site looks like a brilliant online resource. I think be
needing all the help I can to get me started.
My wife and I were recently given a 54 litre tank, (our first), in
which we have housed an engineering goby for the past month.
<Yikes... this fish... gets waaaay too large for such a small
volume>
He was recommended to us as a good first fish to own, being hardy,
tolerant of other fish and very interesting to watch.
<I do concur>
So far things have been great, he was very shy at first, but has laid
claim to several of the rocks in the tank, making a burrow under each,
and will dart around the tank at feeding times.
Yesterday I introduced a second engineering goby to the tank, as much
of the online content I have read seemed to indicate that they were
social creatures.
<Mmmm, IF from the same brood, OR kept in a large (enough) system,
in a shoal>
At first, the newcomer went straight into the burrow alongside our
existing one, but was driven out. Shortly after, it made its own nest
under a new rock I'd purchased at the same time, on the opposite
side of the tank, and they let each other be.
This evening, however, our original goby has been dashing from rock to
rock, evicting our newcomer from wherever it takes shelter. He also
seems to be getting more and more aggressive towards him.
Is there anything I can do to encourage less territorial behaviour in
our original goby, such as providing more shelter, more food,
rearranging the layout in the tank etc, or will they need to be
separated permanently for the safety of the new guy?
I appreciate your help on this one
Harry
<Really... you need a much larger tank, a few more individuals...
Please read here: http://wetwebmedia.com/pholodichthyidae.htm
and the linked FAQs file above. Bob Fenner>
Hector's Gobies and Engineer Gobies
3/8/2010
Hey gang! Long time reader, first time writer. Most of the time I can
find what I'm looking for. Currently, I have an Engineer Goby
<Mmm, a very social species>
who's just now getting his vertical stripes, although in all
honesty I was quite fond of the horizontal ones myself.
<Hee heee!>
This weekend a fish caught my eye and immediately fell in love. When I
asked what it was, I was told he was a Hector's Goby. Boy did my
heart sink. I told the guy I had an Engineer Goby and a first he was
leery, but he said they could probably live together in a 55+ gallon
tank, which mine is just that, 55. I was under the impression that you
should not have two gobies co-existing,
<Mmm, well... the Engineer... is not really a goby or
blenny...>
although from the forums I've read, many people do.
<Oh yes>
So my question is, what is your thoughts? Can these two co-exist since
they are both very peaceful and Bob, my Engineer Goby, only comes out
during feeding or extreme boredom?
<Likely will be fine if there is not too much disparity in their
sizes... i.e. the Pholidichthys can't fit the Amblygobius in its
mouth. Do note the former does/will get much larger in time. Please
read here re:
http://wetwebmedia.com/pholodichthyidae.htm>
Digging out his rock repeatedly, knocking it over and starting again is
about all he cares about except for feeding time!! :) I've tried
search engines, and a few web sites, but I can find nothing that talks
about these two specifically. I hope I'm no bother, but I'd
just love to go back and get him if at all possible. Thanks so much for
your time!!
Jess
<Thank you for your query. Bob Fenner>
Engineer Goby comp. w/ Clown Tang, Maroon Clown or
Blue Jaw Trigger... 2/4/10
Hello everyone at WWM.
<Hi>
I recently acquired a engineer goby from a friend breaking down his
tank.
He had him for two plus years in a community tank. After a week in
quarantine I added him to my doing he was eating good and showed no
signs of disease.
First night in my tank I woke up to my Clown Tang torn to pieces barely
alive. I quickly transferred him to my sump I expect him to die
shortly.
My first question is could the Goby be the issue or is it more likely
to be the Blue Jaw Trigger, also in the tank are a Bi Color Blenny, and
a Gold Striped Maroon Clown.
<Either the trigger or clown are much more likely culprits.>
Also is there anything I can do for the clown if he survives these next
couple hours (i.e. Additives)?? Thank you in advance for all of your
hard work and quick response Michael.
<If he is as torn up as it sounds removal to a QT tank and treatment
with a broad spectrum antibiotic may be beneficial.>
<Chris>
Engineer Goby may be sick 11/11/09
Hi. I'm hoping you can help me; I can't find info on this
problem anywhere, and you guys seem to have a lot of experience.
<Oh yes>
I've been keeping a 30 gal saltwater tank for about a year now, and
just last month moved my 2 engineer gobies (about a year old), 2 clowns
and various cleaner crews into a 50 gal. tank. They used to have a sand
bed, which I changed to gravel in the new tank, there's lots of
live rock that I pushed all the way down to the glass to prevent
cave-ins.
<Good idea>
Tank temp is 80F; I'm a water chemist, so I do my own testing, and
conditions are nearly always "perfect". I had an ICH
infection in the clowns prior to moving, which I made sure was cleared
for more than 2 weeks before adding them to the new tank. The engineers
never got the ICH, but one of them now has what looks like a tumor
under his skin, near his dorsal about 3/4 of the way down his body.
<Perhaps related to the treatment>
His stripes continue right over it; it doesn't look discolored, but
there's just a large bump on his body. Could it be a parasite?
<Small possibility; likely not>
If so, how do I treat? I'd heard formalin was toxic to these
guys.
<Is toxic to all life; a biocide, crosslinks proteins/AAs>
The other guy looks fine. They are both active and eating. Thanks for
whatever help you can give.
-Jessica.
<I would not "medicate" this fish... With time, perhaps
there will be spontaneous remission. Bob Fenner>
Re: Engineer Goby may be sick
11/11/09
Thank you for your reply! I feel better just thinking I'm not
neglecting the little guys.
<Pholidichthys is one of my faves!>
Incidentally, neither was ever treated for ICH; I treated the clowns
separately, because the engineers never had any symptoms,
<These fish are often the very last to fall prey to parasitic,
infectious or environmental ailments>
and once the clowns cleared up, it never came back. It's great to
get your advice; the guy at the fish store said he just kills his when
they get sick.
<... Unacceptable>
Not helpful. Kinda disturbing. Anyway, thanks again!
-Jessica.
<Welcome! BobF>
Quarantine/Engineer Goby 6/17/09
<Hello Shelly>
I have adopted an engineering goby <Engineer Goby> from a guy
tearing down his tank. The fish is large and healthy. He is living
temporarily in my reef tank at home (55g), but is destined for my reef
tank at work (220g). I have never put fish in my tank at work without
treating them with 2 weeks of copper first, but I know this species is
supposed to be intolerant of copper. The other new fish I adopted are
currently living in the quarantine tank (also 55g) with copper and will
go to the work tank after 2 weeks of this, then the "hospital /
quarantine tank" I have can be used for the goby. The tank he is
in now has had ich in the past, so I want to treat him with something
to make sure he doesn't contaminate my tank at work. Should I use a
formalin dip? hyposalinity?
< It's not a good idea to treat fish with copper or other
medications if no signs of a parasitic disease are present. It could
cause more harm to a potentially healthy fish. Is best to observe in
quarantine for two to three weeks. I don't understand why you were
not concerned about putting the goby in your reef tank at home. Since
the goby is already in your 55 reef, I'd leave be and observe for a
couple of weeks. Any disease the fish may have been carrying is now in
your 55 reef, but let's hope not.
To answer your dip question, I would start with a freshwater dip before
doing a formalin dip, may not be needed. See here.
http://www.wetwebmedia.com/dips_baths.htm>
Thanks,
<You're welcome. James (Salty Dog)>
Shelly
Engineer goby, color/beh. 11/20/2008 Hi
my name is Misty Ketner and I have a quick question on my engineer
goby. I have a 55 gallon tank and water quality is good, but my
engineer goby is turning white all over his body can you tell me why?
Thank you for your time Misty <Mmm, I take it we're talking
about Pholidichthys leucotaenia... I have never seen or heard of this
species "turning white"... as young they look to be mimics of
the common tropical reef catfish, Plotosus lineatus (with horizontal
bands of black and white... but at a few inches develop more
intermittent blocks of dark and white... My pitch, pix here:
http://wetwebmedia.com/pholodichthyidae.htm Perhaps yours was
displaying a "sleep/nighttime" coloration... or is/was
stressed? Bob Fenner>
Convict blenny and pistol shrimp 11/1/08
Hello, <Hello Melaine.> Yesterday I added two juvenile convict
blenny's to my well established 120 gallon (saltwater) tank. They
spent the night in the open and this morning had disappeared into the
sand which I expected them to do. Problem is that they burrowed into
the sand at the same end of the tank that my pistol shrimp has his den
and tunnels. I have not heard a lot of "snapping" but was
wondering if the blenny's encounter the pistol shrimp, will they be
stunned and killed? <Could be, see http://www.wetwebmedia.com/alphcompf.htm.>
The two juveniles are slightly bigger than the shrimp. <There is a
good chance they are just hiding, getting used to a new environment at
this point. But, the shrimp could be a problem.> Thanks in advance
for your input, Melaine <Welcome, Scott V.>
Convict Blenny 05/30/2008 Hello Crew, Bob,
<<Hello, Andrew this evening>> I have a 215gallon tank and
I have been researching Pholidichthys Leucotaenia (Convict Blenny or
Engineer Goby) with a view to buying a small group and I have a some
questions that I can't see answers to elsewhere. <<Sounds
good>> I read comment here from Chris J. Gallant about losing the
Scooter Dragonet and was wondering are P.Leucotaenia known for sand
sifting, thus stripping the sand of it's microlife, rather than
just digging? <<They do, however, their main role is doing what
they do best, engineering. They will readily eat any foods, and new
foods can be introduced to the entrance of their burrow to entice them
to eat>> Or do they actively hunt Copepods thus putting them in
direct competition with the Scooters? I have a male and female mated
pair of Scooter Dragonets already and don't want to risk them.
<<I don't see this being a problem>> Also, I read that
P. Leucotaenia should be kept in groups but I can't see a
recommendation as to whether it will be an odd or even numbered group.
<<3 is a good number to go for in your size of tank. Please do
read more here http://www.wetwebmedia.com/pholodichthyidae.htm >>
Could you advise please? Thanks in advance, Campbell <<Thanks for
the questions, I hope this helps. Good luck. A Nixon>>
Possible parasite on my Engineer Gobies 4/28/08
Hello. I have a 210gal Reef tank, 55gal Sump, and my question is that I
have 3 Engineer gobies and 2 of them have these tiny white sticklike
things on them. <Mmm, any chance of a well-resolved photo?> It
almost looks like they were stung by something or they ran into a
cactus with tiny stickers. <Might be crustacean parasites
(copepods), perhaps worms... Or elements from large/r Polychaete
worms...> I have searched the web and could find nothing that looked
like what is on my fish, I have also noticed that my other fish are
rubbing on rocks and my sponges but none of the others seem to have
anything on them. I cannot get a good picture of it but they look like
cactus stickers and are smaller in diameter that human hair. They are
straight (do not bend or move except for where they stick out of the
fish) and are about 1/8 inch long. Thanks for your time. Jillian
<... a photo or two please. Bob Fenner>
Engineer goby, sel.
4/27/08 Hi crew! I read the daily questions daily (of course!) and
based on someone else's question, now we have one. Simple, really
.... we have (among other fish) an Engineer Goby. We originally bought
three, but only one survived. <If you have room, I would try two
plus more... is a very social species> He's now about six inches
long and spends most of his time in one of his many caves carved out
from under the rock (we were careful when we set the tank up to make
sure the rock edges sat right on the glass so his digging would not
cause a landslide). <Good> He comes out to eat. Well, not
actually comes out, but darts out and grabs food. <What
Pholodichthys does....> So now the question: We didn't know that
he (or she) was a social fish. Should we add another one or two (only
available at the LFS as babies)? Will there be adjustment issues? Is
our fish lonely? <Ahh! This is also a very peaceful species... I
would add more definitely. Even smaller specimens will be fine>
Thanks for the help! We have very few fish in our 120-gallon, so if he
could have siblings, we can certainly accommodate them. Thanks. Michael
and Dianne <Welcome. BobF>
Engineer Goby (Family Pholidichthyidae) Stopped
Eating? 4/25/08 Hi, <Hello> I have an
engineer goby <Are social animals, par excellence> (Family
Pholidichthyidae) that I've had for what I believe is over 7
years. He spends almost all his time under the live rock, but has
typically come to one of his cave entrances to feed eagerly on
the frozen krill I've fed him almost exclusively. I hold the
krill <Insufficient nutritionally> with tongs and he comes
up to grab it. Sometimes I can coax him far enough out to see his
entire body, which I estimate is 9" long. He's a great
fish. The 65 gallon tank has 2 clowns and a large pile of live
rock, a large snail and some macro algae. It pretty much takes
care of itself. Lately, the goby has been less aggressive. In
fact, he seems unable to eat. I will hold the krill or just leave
it near his cave and he will put his mouth up against it, but he
won't grab it. I have started just pushing it into his cave
in hopes that he will be able to eat it. I have also tried
cutting it into smaller pieces. But I haven't seen him eat in
quite a while (weeks?). He's still alive, so I guess he must
be eating something. But I am worried about him and wonder if I
should try some other kind of food. What do you think? Thanks for
your help, John <Mmm... well, could be the end of this
specimens life span per the setting, nutritional history... Could
be egg-bound... This species does live for much longer in good
care (at least twenty years)... As stated, they don't live
alone in the wild. Bob Fenner> Re: Engineer Goby (Family
Pholidichthyidae) Stopped Eating? 4/25/08 Bob, Thanks for the
reply. <Welcome John> Is there another food you would
recommend I try? I neglected to mention that I soak the krill in
Kent Zoe vitamins/mineral supplement. <Most any meaty item...
I'd be my usual cheap self and try a bag of "frozen sea
food" from the supermarket... Frutti Di Mar... B> John
<I do think this is worth a try... sometimes P. leucotaenia do
"just go off-feed"... Here's hoping yours resumes.
BobF> Ok. Frozen sea food it will be. Thanks again, J
<Welcome. B>
Re: Engineer Goby (Family Pholidichthyidae) Stopped
Eating? 6/23/08 Bob, <John> Well, I have
been putting food in the tank for the goby, but haven't seen
him for a few weeks. Today, he came all the way out and is
clearly dying. He is breathing very hard and looks a bit
wrinkled. He is not swimming well, either. I am expecting you to
say that he is on his way out, but just in case you have some
treatment ideas, I thought I'd ask you for suggestions.
Should I just let him fade away? <Mmm, I would not...
definitely. What food have you been adding? I would try lowering
temperature... keep adding/soaking food stimulants to the foods
offered, live ghost shrimp, actually adding others of the same
species (are VERY social animals)... Something is wrong with this
animal's world... Bob Fenner> Thanks, John
Re: Engineer Goby (Family Pholidichthyidae) Stopped
Eating? 6/24/08 Bob, <John> Thank you for your
reply. It's good to know that my goby may recover! I have
been adding frozen seafood that I got at the grocery store, per
your suggestion. Squid, octopus, etc. What temp do you think it
should be? <The low 80's F.> Live ghost shrimp?
<Yes... aka Glass Shrimp, Palaemonetes sp...> I will have
to look for those. As for adding another goby, <A few if
there's room> that's going to be tough for me in the
next weeks as I will be away for some time. Plus, I've never
seen one of these fish since I bought him 8+ years ago.
<Surprising... this is one of my fave marine aquarium fish
species> As for his world, I am not sure what has changed that
would cause him stress. The two percula clowns seem to be doing
OK and this system has been stable for many (4-5) years. I am not
saying that nothing has changed, I am just not sure what it is. I
will be doing another water test today. John <Mmm, most likely
a "change in life"... likely this is a female... Bob
Fenner>
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Engineer Goby at work, sys. 03/31/2008
Crew <<Bill>> I have a question regarding the effect of an
engineer goby on my water chemistry. I have a 65G hex tank with some
soft corals, fish and cleaner crew. One of the interesting inhabitants
is an "engineer goby" who, since taking up residence at the
base of the rock pile, has really done a lot of dredging and disrupting
of my DSB. Because the hex tank has a relatively small footprint and
the digging action is so prevalent, I think that he has adversely
disrupted the normal cycle of a DSB. My nitrites are about 0.075,
nitrates at 50mg/L, ammonia is 0.25, PH 8.0, Alk is normal, Mg is 0.04.
My Remora C skimmer seems to be normal. I'm doing 10% water changes
2X/wk and have reduced feeding, but the corals seem to be withering and
I have also had a persistent red/brown algae outbreak.
Suggestions/Comments? <<Depending on the amount of work the Goby
is carrying out, its possible. However, the algae outbreak does not
seem to fit with this behaviour. Elevated nutrient levels and lack of
flow can/could cause the algae issue. Continue with water changes,
ensure feed is not high, maybe re-position a powerhead to provide a
better flow / and or add another powerhead to increase flow. Ideally, I
like to see around 25 x water circulation in a reef system.>>
Bill <<Thanks for the questions, hope this helps. A
Nixon>>
Identifying unique Eels; Pholidichthys -
03/23/08 Hello, I have two eels that I cannot identify and I
was wondering if you could take a look at them for me. <No
problem. These are adult Pholidichthys leucotaenia, aka eel
gobies, convict blennies. Despite their common names they are no
eels, no gobies, no blennies but form a separate family:
Pholidichthyidae, which belongs to the order of perch-like
fishes.> They are yellow and black with round faces. Their
tail resembles a ribbon. I have them in a 50 gallon tank with
several other species of marine fish like a coral beauty angel,
clowns, lawnmower blenny, green brittle star, and a few other
invertebrates. They don't seem to be very aggressive but they
really pay attention to what's going on around them. They
prefer to live up under the live rock and dig in the sand.
<Sometimes called engineer gobies due to that digging.>
They do most work in pairs and but they swim around separately as
well. I also think one of them may be pregnant but its really
hard to tell when I don't know what they are. <Well
possible. They have spawned in captivity and the fry were
reared.> Whatever they are I love them. Here are some
pictures. I can try for better pictures if you need them. Please
contact me personally at my email address if you can. I hope to
hear from you soon. <Hope that's soon enough. A superb
pair of fish. For more information see
http://www.wetwebmedia.com/pholodichthyidae.htm. Cheers,
Marco.>
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Sand sifters I need your opinion on a good sand sifter. I
have read some not so encouraging thing about the serpent stars I
was looking at eating corals, toppling rock). So I was thinking
about getting a goby. I have a 29 gallon with live sand bottom and
was wondering for one if all gobies do the same job of sand
sifting. I really like the look of the engineer goby, if this is not
a suitable sand sifter please advise as to which is a good sifter,
and will one be enough? >> A good species and one that is
not too susceptible to starving in a small volume... One will do. Bob
Fenner
Engineer goby Hi Bob & Co., <Steven Pro this
morning.> I'm considering consolidating some of my smaller tanks
into a larger "misfit" tank of critters that aren't going
anywhere near my reef, such as an unidentified (small!) frogfish, an
overly frisky damsel, and a large coral banded shrimp that got too
rough with other inverts. Basically, this is a system for not-quite
reef-safe critters that I don't want to give up. I was thinking
about building an extra-deep DSB and adding some engineer gobies (P.
leucotaenia). I've always wanted to keep them but was too afraid to
risk a cave-in inside the reef. I do have a few questions, though: 1)
You (Bob) mentioned that engineer gobies are social animals in TCMA,
but could you elaborate more? Do they share tunnel systems, or do they
just peacefully coexist in individual burrows? <I have always seen
them sharing a tunnel system, but I have never kept more than two in a
tank. I also never purchased mated pairs, just two individuals that
ended up sharing with one another.> 2) Are they particularly shy?
Can I reasonably expect them to spend some time in the open? <They
tend to not stray too far from their homes.> 3) Any aggression
problems with other fishes? I suppose I would be asking too much for
them to get along with jawfish... :) <I never had any problems. If
your tank is large enough, 8 or more square feet of bottom surface
area, you should be ok.> Thanks for your insights! Jason <You are
welcome. -Steven Pro>
Convict blenny - read the fine print. 1/16/07 Hi there,
<Hi here? Hi *there*!> I recently purchased a convict blenny for
my 28 gallon reef tank. <Just one? This is a social animal, enjoying
the company of conspecifics.> I had done a bit of research <?>
and decided that one <?> would be a nice addition to my tank, the
blenny is currently living happily in my isolation tank. Is this a good
fish for such a small tank? <Not in my opinion, though you may get
different opinions from other crew-members. http://www.wetwebmedia.com/pholodichthyidae.htm
> I currently have 2 percula clownfish, a six line wrasse, various
snails/hermit crabs, and a variety of sps and soft corals. <Mmm...
without system specs, I'll go out on a limb and suggest you think
of a smaller species.> When I purchased him I figured that I would
need to deepen my sand bed and secure some of the live rock and all
would be well. However, I found some information on various reefer
sites saying that this is a bad fish for smaller tanks <...> and
that they can do quite a bit of damage while tunneling through the
sand. I also didn't realize how large they can grow, mine is
currently 2.5 - 3" long. <What did this "research"
consist of? Looks good, costs little, gimme gimme? No, seriously. These
creatures have no one to care for them other than us. If we don't
have the information required to make a serious effort of keeping them
happy, then we can't begin the task. Proper selection is a key to
happy hobbyists with happy fishes.> Do you think my reef will be
safe and the blenny will be happy if/when I add him? <Not in the
long-term.> Also, how quickly do you think he will grow in my tank?
<Depends on food variety, and other factors too numerous to list,
but I wouldn't be surprised with a double in size within 6-10
months.> I'm probably going to upgrade within the next 2 years
but I would rather know all the info before I introduce him to my tank.
<...Or before you bring him home?> thanks, Colleen <Keep
reading, and don't take me the wrong way, Colleen. I'm just
trying to impress on you the need to research before buying. Imagine if
we had offspring before we had any formula, diapers etc! Please write
with any future Q's you have. -Graham T.>
Pholidichthys
leucotaenia... health 12/13/06 Hello All: Excuse my
terseness, however I am in a bit of a panic. I have the following: 225
micro-reef with several species of corals about 19 fish including
clowns (perc & maroon pairs), Tangs, Gobys and the subject of my
problems 5 (now 4 I'm afraid) Pholidichthys leucotaenia (convicts,
engineers) <Ah, yes... one of my fave fish species> All has been
well for 3 and a half years, no deaths and prolific spreading of
corals. Water is as close to perfect as it can be. 40 gal changes once
a week or so. Some strange aliment has stricken my convicts. They have
splotches of white, deteriorating fins (severe) and clumpy masses
around their faces/eyes and a weird kink in their bodies about a fifth
of the way on their bodies. <...!> NO OTHER FISH HAS ANY
SYMPTOMS. None. Parameters are all nil. Maroons, tangs all very likely
to have ich are all fine. No new introductions in over 2 years. I am at
a loss. I have been extremely fortunate, I know. Hopefully the result
of diligence. But now I am lost. Has anyone heard of such a focused
ailment? <Occasionally... yes> Only 5 out of 20 fish, several
much more susceptible than the hardy convicts? Thanks, Walter <Do
agree with you re the hardiness of this species... I do suspect that
some event with organisms living near the bottom of the tank...
Cnidarian/s likely, is at play here... perhaps a spawning even,
consumption of reproductive products has led to the present situation.
The most I would do is try to bolster the "Gobies" immune
systems by soaking their foods in a vitamin/supplement prep. here...
and hoping for self-cure otherwise. I don't think moving them to
other conditions would be prudent. Bob Fenner>
Sand-Dwelling
Gobies and Bare-Bottom Tanks - 07/24/06 Good afternoon.
<<Morning now...>> I currently have an engineer goby that I
have had for about 1 1/2 now in my 120 reef tank. I have a
4" sand bed in the tank. I am planning on an upgrade to
a 180, but I plan on going Bare Bottom. I know that the
engineer goby burrows in the sand as mine always does, but is this
necessary for its life. <<Ultimately, yes...will likely suffer
psychologically without something in which to
"engineer">> So my question is: Can an engineer goby
live in a tank with no sand. <<Not recommended>> Also, I
have a Watchman goby and the same question goes for him. <<As
does the same reply...>> Thank you. Joe <<You're
welcome Joe...EricR>>
Engineer Gobies/Blennies... actually Pholodichthyids
2/1/06 Dear Dr. Fenner, <Just Bob
please, no doctorate>
I
recently ready your article "Convict Blennies, Family
Pholidichthyidae," and found it quite interesting. I am currently
enrolled in a 3-year science research course, and I want to research
convict fish. In your article you referred to "Pholidichthys
leucotaenia- the white-striped goby" published in Aquarium Digest
Intl. - I have not be successful in locating this reference. Do you
know how I can get this article? <Mmm, perhaps a call out, visit to
a local (freshwater) tropical fish society... Some of the folks or the
club there will likely have the issue... or a large college library...
where the school has a bio./zoo. dept.> In addition, if you are
aware of any other articles or if you know of any current research
projects being conducted on these fish I would greatly appreciate your
help. Thank you very
much. Madeline
Marens <Mmm, you might try visiting local public aquariums. Many
make use of this species for ornament and to dig about large reef
systems on display. Bob Fenner>
Engineer Goby sick???
12-05-05 Hello, <Hola> What a fantastic site you have!
<Thanks> There is not enough hours in the day to read all of the
valuable info you have posted. I am sure happy I came across your site.
<We are glad you did too.> I have a 60gal with the following:
Coral Beauty Maroon (gold stripe) Clown Yellow Head Jaw Fish Engineer
Goby Chocolate Chip Star Sea Cucumber Cleaner Shrimp A few small
hermits and one snail 45+lbs live rock 2 NO bulbs (one blue) Sump
w/protein skimmer I just did about a 10g water change a week ago, but
do not have any test levels. 4-5 days ago I noticed that my engineer
Goby had what looks like a cross between a white powdery to a white
fuzzy substance on 75% of his body. (Sorry, not sure how else to
describe it.) <No problem, the description works for me.> He
shows no signs of heavy breathing (at this time), and maybe slightly
less active, but for the most part seems normal in behavior. (Came out
from to rocks to eat.)<Eating is always a good sign.> Now I have
a yellow eyed tang that died around the same time I started noticing
this on my EG, but I only had him for about 3 weeks and I believed that
he died of stress from being harassed by the clown. (I never observed
this but the clown has a mean streak, and I could not see any signs of
illness on the tang. The tang did show some signs of stress (?) by
constantly swimming up and down the glass, but he stopped a few days
before he died and was acting normal again. <Sounds like your
tang came in sick. That is why a QT tank is so important. That tang
should have been in QT for 6 weeks before it reached you display.>
Anyway, I read on your site that the EG is a very hardy fish and is
usually one of the last to show any signs of illness. To the best of my
knowledge all my other occupants are doing fine. <Watch the EG
and feed him well. Hopefully he will fight off this new infection on
his own. Also, do yourself a favor and go out and buy a hospital tank.
Trust me it will save you more money than it will ever cost.> Any
help or suggestions will be greatly appreciated. Thanks, Jim Phx,
AZ <Happy to help. Travis>
Re: Engineer Goby sick??? 12-14-05 Hi everyone, <Hello>
Thanks for replying to my original question. <No problem.> Since
then I tried sending another email with a pic of my sick EG but it
seems you never received. (I was concerned because he did not look like
he was getting better.) He has since started to improve (less slime on
the body and eye clearing up, eating great, more visible before
feeding) so I have some new questions: Lets say he is shaking this off
and will be okay without any quarantine etc, what about my other fish?
Did they have (or built up) an immunity to this? <They most likely
already had an immunity to it. All animals should be able to deal with
any natural infection on their own, as long as they are healthy.>
Will it (what ever it is) still be in the tank, and what should I do
about it? (If anything) <It will be in the tank, just as the
chicken-pox virus is around you everyday. You will never 100% clear a
tank of disease. You can only keep your fish as healthy and ready to
deal with infection as possible.> How long should I wait to add
another "something" to the tank. (Am I at my max
occupancy already?) <That all depends on what you want to add. If
you want to add a shark... then YES you are at your max capacity.>
Also At this time I have a spare 10gal., but do not have
anything else such as a heater, powerhead, light . . . What size tank
do you suggest for a QT that I can use on a regular basis? I
am thinking of buying a 3-5g setup at a discount store.
Would this work or should I build on the 10g I have? <I suggest a 10
gallon minimum.> Just as a side note: The local store I go to has
been great with every aspect of the hobby for me. They quarantine their
new stock for a period of time before placing in the display tanks.
This is why I never bothered with a Q tank at home. <That is great,
but you will want to investigate how they are QTing their fish and for
how long. You will also want to make sure the fish are not being
QT'd and then reintroduced to water from other fish. Hope that
helps and good luck, Travis.> Thank you very much for any help Jim
Eel gobies Hi, I was wondering if you could possibly give me any
information on the eel gobies. I've been searching for
quite some time trying to find out anything about them. I
wanted to know what they eat, are they reef safe, how aggressive they
are and how large they get. I've seen these fish a few
times at the fish stores but no one seems to know anything about them,
so any info is greatly appreciated. Thanks for your
time. Sara >>Hi Sara. Unfortunately,
I'm not familiar with any goby that is suitable for a reef that is
called an "eel goby". I will give you some links
in the hopes that we can better determine what fish it is you're
speaking of. Try here--> http://www.wetwebmedia.com/marine/fishes/index.htm
and on Google my first "hit" was this--> http://www.amonline.net.au/fishes/fishfacts/fish/tpurpur.htm
If it was this monster--> http://sunflower.bio.indiana.edu/~sholtzma/fish.html
then I would have to say that I don't believe he'd be very
suitable for a reef system. <See Pholidichthys... on WWM.
RMF>
Convict blenny/goby Hi Bob, <Brent> It's been a
long time since I last contacted you, a couple of years at least.
<Still here, there> Since then I have had a reef tank up and
running using Eco-system method, I have removed the TurboFlotor 1000
skimmer with much success. I have a clam, open brain, finger coral,
toadstool, pulsing xenia and a bubble tip anemone, plus several types
of mushrooms and algae. Inverts are as follows: 10-15 turbo snails,
10-15 red legs, Maldives starfish and a blue Linckia, boxing shrimp and
a cleaner shrimp My fish stock comprises of a chevron tang, coral
beauty, pair of maroons in the host anemone, 5 green Chromis, a
mandarin fish and 4 convict blenny/gobies. <Topped off for sure>
The reason I am writing to pick your brain is that the convicts (which
I love) have become emaciated, all other fish stock look fine. At first
it appeared that it was only 1 of the fish that was affected but on
closer inspection ( not easy with these fish as you will appreciate)
all seem to have some sort of infection. <Maybe so> The fish are
fed with an assortment of frozen foods soaked in Zoecon and Zo?marine,
a dried pellet food and sea veggies (which to be honest I don't
really rate that highly). <I'd make my own> I've attached
a photograph to hopefully help in identifying the disease.
<<Photo is SO out of focus there is naught to do, cannot post
this.>> Thanks Brent. <Are you sure these Pholodichthys
are just not receiving sufficient food period? For what appear to be
sedentary animals they are quite "high metabolic"... You
could try adding Metronidazole to their food for a few times. Please
see here: http://wetwebmedia.com/metranidazole.htm.
But I would first try offering more meaty foods right down near them...
twice a day for a week or so> I write to you as it was your book
(Conscientious Marine Aquarist) that got me into this fascinating hobby
in the first place, love the website too. <Thank you my friend. Bob
Fenner>
Convict Blenny Hello Bob, I just have a quick question. How
long will a Convict Blenny live in captivity? <For many years...
this is one of my favorite species (Pholidichthys), so do look for them
about... there are some European public aquariums that have had this
species for teens of years> I know it depends on tank conditions and
100 other things, I'm just looking for an average life span. I have
one that almost 3 years old and lately it has been looking raggedy. My
Tank Water is good, and its tank mates are in good shape. Is it getting
old or is it sick. It looks like its skin is peeling like it had a
sunburn. Thanks for your help. Tobin <Generally a very hardy
species... If all your other livestock look okay, I'd bolster its
nutrition by adding some other meaty foods, soaked in a vitamin prep.
(e.g. Selcon). Bob Fenner>
Convict Blenny question Is there any way to tell the
difference between the male and female Convict Blenny.
<Not as far as I'm aware, and have seen breeding adults (last at
the Aquarius Aquarium in Long Island)... they were a good eighteen
inches long and not-discernible> Also we read on your website that
they are social. We have a 100gal and just bought a Convict and wonder
if he would be happier if a mate was purchased. I do not think we have
room for three. <This species is definitely "happier" in
groups... will be seen in almost constant association with
conspecifics. I would definitely add one or more in addition.>
Thanks, and we love your site. Jerry Kammer <Thank you for being
part of it. Bob Fenner>
Growth Failure in Convict Blenny
(4/27/04) Crew, <Steve Allen today> Thanks again for the
patience that y'all have, the greatest resource for the lost out
there. <It's pleasure to play a small part in it. I have learned
so much here myself.> I have an interesting issue. I
purchased 6 "neon gobies" from my LFS about 3 months ago.
They were about 1.5 inches in length and lots of fun to look at. After
spending ~6weeks in my vert QT they were fine and into my 200gal reef
they went. I figured out rather quickly that these were not neon
gobies, but convict/engineer blennies/gobies (Pholidichthys
leucotaenia). I discovered this from Mr. Fenner's glowing
recommendation of this interesting fish. So in a vain attempt to inform
my LFS of his mis-labeling, I brought in a pic from the book. No help.
<Some folks are truly stubborn.> Anyway, now 5 of them are over 4
inches long and dig constantly (amazingly, and gratefully, I placed the
LR on the glass before adding the substrate). <Good move.>
The issue is with the 6th one. It has not grown at all, not
a mm. It is still about 1.5 inches and only hangs with the other boys
about 10% of the time. A portion of his time he spends laying on the
bottom, almost motionless. He recovers (?) and is back to swimming
alone after a short time. At 1st I thought that I was sold a real
"neon", but after looking closely he looks like a miniature
of the others. He also is the only one that seems to be hunting
creepy-crawlies on the LR, I saw it with my own 2 eyes! Any ideas?
According to Mr. Fenner he has rarely seen one take ill, so I am
curious as to your thoughts on this "Dwarf" Pholidichthys
leucotaenia. Most of the time he acts just like the others, I just
worry about the laying on the substrate thing. 1st time I saw it, I
thought he was dead. He's lasted over 3 months including the
quarantine time and he's still alive, although admittedly stunted
for some reason. I appreciate any ideas you can offer, I get really
attached to these guys and I've been fortunate with my charges thus
far, so I'm worried... Regards, Walter <Well Walter, it's
hard to say for sure here. Many factors, both genetic and
environmental, can lead to stunting. It could be lacking the hormones
it needs to grow any bigger. The behavior suggests that it is more
likely lacking some nutrient (perhaps being out-competed by the others)
or is inhibited by being "odd man out" or "the runt of
the litter" so to speak. If he is not wasting away, perhaps he
will be fine but small. If you could easily catch him and put him in
another tank, you could find out for sure, but I suspect that's a
lot of effort in your tank. As long as he appears to be free of
contagion, it may be best to just leave him be.>
Convict Blennies Hello Bob Fenner, <Chris>
Bob I wrote you an e-mail back in October regarding the 3
convict blennies that I had purchased who where growing and
quiet active in my 72 gallon aquarium. Recently
however they have started hiding and don't even come
out to eat like they use to, they simply peek out from the
bottom and wait for the crumbs to fall to the bottom. I
have noticed that one in particular has built a cave which
I can see from the bottom of the aquarium, actually under
the glass, where it remains during the day kind of curled
up. Is it possible that these convict blennies
will produce and offspring? If not, is it normal for them
after such a long period to become secluded? <Is possible that they
may reproduce. Saw a breeding community at the Atlantis Aquarium on
Long Island last year... big animals, maybe a foot and a half in total
length. Otherwise the behavior you describe is "natural". Bob
Fenner> Best regards,
Chris J. Gallant
Worm Goby (convict blenny) This is my worm
goby the LFS didn't know what it was and had ? as its name and
they where 3 for 6 bucks not bad price this ones at his adult stage
and never comes out more that his head to snatch on passing food
notice the blotchy pattern I'm not sure how long he is maybe 5
or 6 inches this is a great fish feel free to use the pic on the
web site :) <Mmm, looks like Pholidichthys to me. Please see
here: http://www.wetwebmedia.com/pholodichthyidae.htm
Bob Fenner> |
|
Convict Blennies Hello Bob Fenner, <Howdy Chris> I
purchased 3 little convict blennies a couple of months ago thinking it
would be a nice addition to our 75 gallons tank. They now
measure over 6 inches in length, have practically dug out all the
possible live sand (about 3 inches deep) around and eat like its going
out of style. My little scooter dragonet died and I am
thinking it was due to a lack of food on the surface of the sand which
use to be abundant. <Very likely so> The question is; how much
bigger will my 3 stooges get and will they cause any harm? I
am thinking of increasing my crab, snail and invertebrate population
however I am getting worried that there may not be sufficient food left
for them to graze on. <Can get to more than a foot in your
setting... not likely to cause trouble other than food competition,
undermining anything not firmly stacked above the substrate. Bob
Fenner> What do you think? <Here're my pix: http://www.wetwebmedia.com/pholodichthyidae.htm
Bob Fenner> Best regards, Chris J. Gallant
Eel gobies >Well I'm back to bug you
again. >>Oy! LOL! Alright Sara,
let's see what I can do for you, eh? >I just have a few more
questions to ask you. I have just recently set up my 75g
tank to move my fish into. So my first question is if you
think the 700 gallons per hour that my filters run plus whatever my
skimmer does in an hour is enough for a 75g tank, or should I add some
more filtration on to it? >>Ok, so as I understand
it, you have a turnover rate of just under 10x/hour, just with filters,
yes? If so, I think this is just sufficient, though I would
take care not to crowd animals. >My original plan was to
run 1000 gph with two filters but I can't get them both to fit onto
the tank with my skimmer there as well. Now my next question
is about my PJ cards. The three largest cards are looking
great but the smallest one always looks so beat up. Should I
expect the smallest one to always look like this or will the rest of
them back off at some point in time? >>Are the other
cards doing the beating? If so, space may not be what they
need, although it won't hurt to give it a chance. Since
you've ended up with four, it may actually help to purchase one
more cardinal--he'll likely be low man on the totem pole, and if
you get him sufficiently large he'll also be less likely to be
picked to death. >Now that I have the 75 up and running I was
becoming interested in purchasing a coral beauty. I've
never attempted one of these before, i wanted to wait till I had a well
established system. So I've been looking up lots of info
on these guys and was wondering if you think that they are safe enough
to go into a reef tank. I have a few different types of
polyps, a lot of mushrooms, some cup corals, sun corals, a gorgonian
plus two sebae anemones. >>Eee...everything was great
till we got to the anemones. You've picked the more
difficult species here, and almost all desirable anemones have dismal
records of survivability in captivity. It is told that their
lifespans are on the order of centuries, yet in our tanks it's rare
for them to live beyond a few years. Also, should the
anemones decide to move around, they will sting all other sessile
invertebrates. Next time you decide on anemones, pick
something with a proven track record that folks are getting splits off
of like the Bubble Tip Anemone. Hopefully these ones you
have won't move around very much, but do watch them for impending
death as they'll crash a system quickly if you're not
careful. >>As to the question of the Coral Beauty, I
kept one in my own reef tank for years, with no troubles. It
was the MANTIS SHRIMP I had trouble with (accidental introduction, no
more skipping q/t for me!). So I think you should be able to
keep one. However, there are those stories out there of them
being polyp eaters/nippers, so watch him carefully. >I also wanted
to know if they should be fed a marine angel type of diet or if
they're better off with lots of greens. >>A variety of foods
is what's necessary, offer them both, along with more meaty foods
such as Mysis shrimps, finely chopped squid, clam, octopus, and
shrimp. Soak food in Selcon a few times a week, and everyone
should receive good nutrition. >I know that angels can become
aggressive towards other fish in the tank so do you think the beauty
would be ok with my docile cards? >>I would expect no
trouble between the Centropyge and the cards. Just remember
that this will be the only Centropyge you can have in the
tank. >And now I only have one more question for
you. I've been reading that the beauty's from the
Philippines aren't hardy at all but I haven't found any info on
how to tell the difference between a Philippine beauty and the rest of
them. So is there any way to tell where it came from?
>>It's not that Coral Beauties from the Philippines
aren't hardy, it's that it is more likely than not that
they've been collected with cyanide. There are other
fish from the Philippines that are routinely collected with cyanide, as
well. The best way to tell is to ask your dealer, though
many don't pay attention, they just go for the cheapest
fish. I can tell you that the wholesaler I will be working
for sells Philippine fish, but she has also worked VERY hard to find an
exporter who deals in NET CAUGHT fish only (please don't fall for
MAC--this organization has not put a viable cyanide detection test in
place). So, when the shop orders their fish, their
wholesaler should already know where the fish came from. One
excellent way to tell if any fish has been exposed to cyanide (not
necessarily collected) is if they eat yet waste away. Also,
if the dealer has both huge number and huge variety of Filipino fish,
you can be fairly certain that the active, difficult-to-catch fishes
are likely collected with cyanide. Other than that, I know
of no way to differentiate between a Philippine fish and, say, one from
Tonga. I hope this helps! Best of luck with the
bigger tank, Sara. Marina
Gobies, blennies... Atlantic... Pholodichthys? Hi have you
ever heard of an Atlantic goby or Atlantic blenny? I bought 3 of them
for 1.99 each at the pet store (cheap for saltwater fish) they are long
3" like an eel they have a black stripe on it they have made a
tunnel in the sand and they live under the sand got any ideas? <They
sound like engineer gobies from the description but I could say for
sure with out a pic. thanks JM
Convict blenny & deep send bed Hello, <Hi Petr, Don
today> I recently added deep send bed (6" of fine Southdown
sand) to my 55gal reef tank w/ sump, Turboflotor 1000 skimmer, live
rock (~40lbs). I dose Kalk and Seachem's Reef
buffer. <Sounds good> I currently have a yellow tang,
two convict blennies, red Linckia starfish, a few snails and hermit
crabs, and some zoanthids living on my live rock. I love the
DSB for the way it looks in the tank and also for its
benefits. My only concern is that my blennies seem to enjoy
digging their little homes under and around the liver
rock. And it is not just one or two holes, they are
digging around almost every piece of LR in the tank. Is this
going to mess up the denitrification process in the DSB that I'm
trying to foster? If so what should I do about
it? Thanks... <Just blennies being blennies! You might
try adding some rubble (empty shells, small fragments of rock, etc) and
see if they don't use these to build a 'home' and settle
in. Hope this helps, Don> Petr
Re: eel gobies >Thanks for looking into this for me but
none of the pics that you sent to me are of the one that I've
seen. >>You're welcome, sorry the pics don't
help. Is there any way you can get a picture? If
you can get a picture, of if your LFS has a marine fish
"Bible" (identification book) it would help us help you.
>I have recently seen a picture of a convict blenny and it does look
almost identical to the eel goby, so my next question for you is could
these two fish be the same thing, just having different names?
>>ABSOLUTELY! This is the bane of aquarists round the
world--local common names vs. correct taxonomical names. And
this cross-over from goby to blenny and back again is quite common as
well. Your shop may have simply misidentified the critter in
question. >I also had another question about the boxer/Pom-Pom
crabs. Can you have more than one in a tank? I
had two for a very short time and then one just died for no apparent
reason. The other one I've had for about a year with no
problems at all. >>I think you've answered your
own question. I wouldn't try adding another, especially
considering that you appear to have a breeding pair of Stenopus in the
same system, yes? It may very well be that they (Pom-Poms)
won't tolerate each other, as well. Take a look
here-->
http://www.wetwebmedia.com/marine/inverts/arthropoda/crabs/swcrabs.htm
>Also could you give me any info on how the crabs
breed. Shortly after acquiring the first one she became
pregnant. I was wondering if they are like shrimps and seem
to always carry eggs or if they only carry them if they've been
fertilized. >> Look here for some information-->
http://www.wetwebmedia.com/marine/inverts/index.htm
>>I will tell you this, many, many animals have a planktonic
larval stage. The crabs may carry eggs (unfertilized as
well), they may even carry fertilized eggs, but to rear the young would
take a dedicated system. If you have filter feeders I say
let the eggs and any subsequent larvae become food for the
system. I have been unable, at this point, to find specific
sexing information. >I have just one last question for
you. i have very luckily gotten two coral banded shrimps to
pair up, the female of the two is carrying eggs now so i was wondering
how long does she carry them before releasing them? Also do
you happen to know what color the eggs are supposed to be if
they're fertilized and what color the eggs are if they're not
fertilized. Thank you so much for all of your
help. Sara >>Try here-->
http://www.wetwebmedia.com/marine/inverts/arthropoda/shrimp/stenopus.htm
>>I know that the ovaries of female CB's are dark and easily
visible, and I also know that you are indeed very fortunate to have had
a couple pair up! Don't worry too much, though, as once
they've begun breeding, it's unlikely they'll want to stop
anytime soon, eh? ;) That will allow time to
gather whatever information is out there on breeding. You
may also want to visit other reefing sites, such as
www.reefs.org This is a good means of gathering information
that may not yet be published. Our own site has a
Breeder's Column at http://www.wetwebfotos.com/talk
<----------------------------------------------------------->
<<<OK FOLKS, anyone have anything else to add to this PLEASE
DO! My learning curve is stretched at the moment, and I can
feel my brain wrinkling as I sit
here! LOL! Marina
Re: eel gobies thanks for looking into this for me but none
of the pics that you sent to me are of the one that I've
seen. i have recently seen a picture of a convict blenny and
it does look almost identical to the eel goby, so my next question for
you is could these two fish be the same thing, just having different
names? <Yes, likely so. Please see here: http://www.wetwebmedia.com/blennioids.htm
about in the middle.> i also had another question about the boxer/
pom pom crabs. can you have more than one in a tank? <If
the system is large enough... dependent on the size of the crabs as
well... and has enough physical break-up of the space... for hiding,
getting away> i had two for a very short time and then one just died
for no apparent reason. the other one I've had for about
a year with no problems at all. also could you give me any
info on how the crabs breed. <Please see WWM re>
shortly after acquiring the first one she became
preg. i was wondering if they are like shrimps and seem to
always carry eggs or if they only carry them if they've been
fertilized. i have just one last question for
you. i have very luckily gotten two coral banded shrimps to
pair up, the female of the two is carrying eggs now so i was wondering
how long does she carry them before releasing them? also do
you happen to know what color the eggs are supposed to be if
they're fertilized and what color the eggs are if they're not
fertilized. thank you so much for all of your help.
Sara
<Keep studying my friend. Bob Fenner>
Re: eel gobies >well right now they're in a 40
breeder, will be moving to a 75 later on. >>How much
later on? A 75 would give you plenty of room to give the
pajama some mates to play with (mates as in friends). >i have a
small Sailfin tang, orange tail damsel, lawnmower/algae blenny, PJ
cardinal, and 3 convict blennies, 2 CBS, pencil urchin, long spine
urchin, blue tuxedo urchin, sally lightfoot crab, 2 emerald crabs, 1
pom pom crab, around 20 blue legged hermits, 6 Astrea snails, 1 brittle
starfish and a few different types of soft corals. i run 2
filters in my system so I'm close to 700 gallons per hour plus a
deluxe Prizm protein skimmer. >>Holy cow,
Batman! That's some good water movement for a
40..LOL! Good thing, it's what the cards like.
>I'm not sure how much that one pushes in an hour. >>Other
than suggesting these fishes get into the 75 sooner rather than later,
it sounds pretty good to me. Good luck with it all,
Sara. Marina
Gregarious Gobies! I am curious about the convict/engineer
goby. Does this fish live in groups in nature or is it a
solitary fish. Does it share its burrows with others of its
kind? Thanks Fred. <Well, Fred- the answer is yes- and no! Many
times these fishes will congregate into small groups in the aquarium,
and are quite gregarious. I have seen other specimens that seem to live
a more solitary existence...always seems to boil down to the individual
fishes in question. I'd start out with a small group and see how
the interactions work out.. Good luck! Regards, Scott F>
Engineer Goby Hi, I am a long time reader and first time
'asker'. My LFS received some fish from someone dismantling
their tank. One of them, the one that I purchased, has a goby like head
and a Tesselata Eel type body, black and white in color. Neither of us
can I identify it and were wondering what you think it may be. <It
sounds like a good description of the Engineer Goby.> It burrows
into the substrate, somewhat like a Pistol Shrimp does, making huge
mounds of sand around it. From afar, it has the appearance of the above
mentioned eel. Any help would be appreciated. <Please take a look at
the pictures here to confirm, http://www.wetwebmedia.com/pholodichthyidae.htm>
Thanks, Sean <You are welcome. -Steven Pro>
Re: Engineer Goby Well, I am in awe at your response.
<Truthfully, your description was pretty good and not too many other
things it could have been. Frankly, I was surprised to here your LFS
could not ID an Engineer Goby that they had in their possession. They
are by no means uncommon.> It appears that you are correct. It looks
like an adult, about 6 inches in length. I guess they change their
appearance as an adult. <Yes, they begin with the horizontal stripes
and slowly change to the banding.> Thank you very much, Sean <You
are welcome. -Steven Pro>
Engineer Goby Hi, I am a long time reader and first time
'asker'. My LFS received some fish from someone dismantling
their tank. One of them, the one that I purchased, has a goby like head
and a Tesselata Eel type body, black and white in color. Neither of us
can I identify it and were wondering what you think it may be. <It
sounds like a good description of the Engineer Goby.> It burrows
into the substrate, somewhat like a Pistol Shrimp does, making huge
mounds of sand around it. From afar, it has the appearance of the above
mentioned eel. Any help would be appreciated. <Please take a look at
the pictures here to confirm, http://www.wetwebmedia.com/pholodichthyidae.htm>
Thanks, Sean <You are welcome. -Steven Pro>
Re: Engineer Goby Well, I am in awe at your response.
<Truthfully, your description was pretty good and not too many other
things it could have been. Frankly, I was surprised to here your LFS
could not ID an Engineer Goby that they had in their possession. They
are by no means uncommon.> It appears that you are correct. It looks
like an adult, about 6 inches in length. I guess they change their
appearance as an adult. <Yes, they begin with the horizontal stripes
and slowly change to the banding.> Thank you very much, Sean <You
are welcome. -Steven Pro>
Engineer Gobies "Illness" We have three Engineer
Gobies in our tank that have varying degrees of the same illness. They
have white or gray cloudy spots spreading on their sides. The worse of
the three has it clouding over the eyes. The side (pectoral?) fins have
disintegrated (each of the three have different levels of
deterioration) as well as the "fins" that run along the top
down the back. <perhaps a combination of pathogens here> Our fish
caretaker has tried two different medications over the last 3-6 months.
Each time the fish appear to get better, but then start to get worse
again after awhile. <it would help to know the meds but I will
guess that some dreadful gram positive antibiotic like
Maracyn/Erythromycin was one of them. Too commonly dispensed and nearly
useless for marine diseases. Please use a Furazolidone and
Nitrofurazone mixed drug in a bare bottomed QT tank for optimal
results> What ever the gobies have isn't affecting the other
fish in the tank (clown fish, yellow tail damsel, shrimp, starfish, and
a yellow fish (big 2", flat, with a pucker mouth) I can't
remember the name of). Do you have any idea what the gobies have that
isn't affecting the other fish and any possible cure for their
symptoms? <each fish and species has a different resistance...
the others may never get this or it can occur in time. Please
understand and employ a proper quarantine tank for all new and sick
fishes> We are considering taking them out and replacing them with
something else, but if we can cure them we'd rather keep
them. <"take them out" as in destroy them? That
seems to be the message here as evidenced by your qualifying statement,
"but if we can cure them we'd rather keep them." Hmmm....
you are making me sad here. Else you must know that dumping them on
somebody else or the pet store while they are sick will likely kill
them anyway> All the fish get along well and the gobies are pretty
happy most of the time. It gets scary when the one goby that has the
worse symptoms gets really bad and the others chase him out of the
hiding place, then the clown fish will push him around (territorial
maybe or trying to keep the goby going). <yes... sad to see> The
medications have definitely helped the gobies show improvement, the
cloudy spots go away, the eyes clear and the fins start to look
healthier (at the beginning seemed to grow back some), but now it seems
like they get the "problem" back faster each time.
<the meds are not the right kind or strength. They need to be dosed
for at least five days and either longer or stronger if not done in a
bare QT tank (the gravel/rocks temper and absorb medication efficacy in
your display tank).> Out of the three there was one with the least
symptoms (he was the only one who still had complete side fins, but now
they are deteriorating quickly and it's so sad to watch. <they
are extremely hardy fishes and can likely recover easily> The
medications were (sorry I don't know the names) white oval pills we
tried 4-5 different times and most recently a stinky yellow round pill
that makes the water turn yellow we tried twice. <Egads... the
second med was Tetracycline!!! My friend, your fishkeeper needs to
learn more about fish meds. Both of those drugs were outdated in the
80s. Many bacterial immunities to them... no wonder they didn't
work. Its unfortunate that the pet stores still sell them. Let me
recommend to all the excellent new fish disease reference by Noga and
for an older but less expensive and still relevant reference:
Untergasser's Handbook of Fish Diseases (TFH)> Thank you for any
help you can offer. <If you haven't considered it already...
there is an excellent aquarium Society in San Diego where you can get
great local advice and support from fellow aquarists: SDMAS Aquarium
societies are wonderful places for great information and fellowship.
Best regards, Anthony> Michelle F. Baker
Unknown Fish Hello, a few months back I discovered a fish
under my live rock that I didn't purchase so I figured it found its
way in the tank off the rock. I e-mailed you guys about this and you
said it would be helpful if you had a picture so here is a few. The
fish was only about three inches when I discovered it but now its on to
about 6-8 inches and still growing. I know its not an eel because it
has pectoral fins and no noticeable teeth. Thank you for your help and
hopefully you recognize it. <Please see the WetWebMedia.com site re
Pholodichthyids. Bob Fenner>
Injured convict blenny Dear Bob, My 100 gal FOWLR has housed
five 7"-9" convict blennies (Pholidichthys leucotaenia) for
the past year and a half. <Really neat animals> They've
seemed quite hardy and happy constantly rearranging their homes in the
5" sand bed. Other inhabitants are: 6" Foxface rabbit,
5" hippo tang, 2" flame angel, sand-sifter bullet goby,
lawnmower blenny, snails, small scarlet hermit crabs, and one tiny
Aiptasia. Last night I noticed this smaller 7" convict constantly
skimming the surface of the tank. All the others were tucked into their
sand homes. I thought this was suspicious behavior, since sick fish
often swim near the surface, I suppose for more oxygen. <A good
guess... or too much carbon dioxide...> On closer inspection, I saw
that his tail has been eaten. The last one inch of his tail is gray,
obviously eaten, and some red open wound streaks. I isolated him in the
plastic breeding cage for the night and prepared and transferred him to
the hospital tank this morning. I began treatment with Melafix. What do
you suppose happened? <Maybe a fight started this... or a
falling rock...> My only guess is that somehow he got a scratch on
his tail and the other members of his family began picking at it like a
bunch of chickens. When he makes it back to health (I'm being
optimistic now, he really doesn't look very good), I will put him
in the 40 gal Caulerpa tank which has one maroon clown and one pajama
cardinal and one CB shrimp. <Okay> The hospital tank is ten gal,
bare bottom, two coffee mugs for hiding, heater and whisper filter,
water from the main tank. Melafix, 1tsp/day as per instructions. Do you
have any other suggestions? Thank you, Fellow convict blenny lover,
Linda <Mmm, only my well-wishes. Kia orana my friend. Bob
Fenner>
Convict Blenny offered as "worm goby" Dear Bob,
Offered as "worm gobies" for only $5.95. But my reading of
your book enabled me to identify these as "Convict non-goby,
non-blennies". I find them attractive and may add a few to the
community. Your writing is clear on their hardiness. <A fabulous
species for aquarium use... seemingly very intelligent, and definitely
comical...> Is this a desirable fish for my very peaceful community
which now contains a true Percula clown, a sleeper goby, a yellow
Hawaiian tang, 3 neon gobies, and a Gramma? Also some mushroom
anemones, yellow polyps, and bubble coral. I don't want a fish that
bites others (as some blennies do) or eats corals and polyps.
<Shouldn't eat, bother invertebrates... but are active enough to
cause your sleeper problems by eating all the food... do get to about a
foot in length... saw some old-timers at the Steinhart Aquarium two
days back...> The refugium looks great and all the plants are doing
well except the grape Caulerpa is turning gray and doesn't appear
happy. Could this be too much light? I have moved it to the bottom of
the tank. <Maybe... more likely an incompatibility with other algae
species... but it may still rally... I'd leave it where it is>
Thanks for the advice on the pH controller. That will save a couple
hundred bucks for other projects and livestock. <Ah, good... we
share the same addictive attitude... Bob Fenner> Howard