FAQs about
Montipora Munching Nudibranchs
Related Articles: Coral Pests and Disease; pests, predators,
diseases and conditions by Sara Mavinkurve, Acroporids, SPS
Corals,
Related FAQs: Acroporid
Disease 1, Acroporid Disease 2,
Acroporid Disease 3, Acroporid Disease 4, Acroporid Health 5, Acroporid Health 6,
Acroporid Predators/Pests,
& Acroporids 1, Acroporids 2, Acroporid Identification, Acroporid Behavior, Acroporid Selection, Acroporid Compatibility, Acroporid Feeding, Acroporid Systems, Acroporid Reproduction, Stony/True Coral, Coral System Set-Up, Coral System Lighting, Stony Coral Identification, Stony Coral Selection, Coral Placement, Foods/Feeding/Nutrition, Disease/Health, Propagation, Growing Reef Corals, Stony Coral Behavior,
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Aeolid Nudibranch ID?
6/18/15
Hello crew!
I have been successful for years due to wealth of information this site has to
offer. Thank you for your time and service! Now I am hoping I can get a
verification of what I think I have learned after reading lots of links here.
<Ahh!>
I have had a pistol shrimp / Goby combo for the last three years. This year we
slowly started adding corals to their tank. I have diligently QT everything we
bought and everything has been cleared and in the display tank. Well, (yep here
it is...) except some rock rubble that I bought last week for the pistol shrimp
(he gets so excited about new rocks outside his
door) from my local saltwater retailer's live rock bin.
Two days later I saw this guy on the glass, he was about the size of a grain of
rice, and I removed him from the tank (picture attached taken with a magnifying
glass). Two days after that my only piece of Montipora has batches of these same
things around the base.
<Trouble; are Montipora eaters. Need to isolate, and likely dip/bath all
incoming corals to avoid such undesirable hitchhikers>
The Montipora is now in a hospital tank and manual siphoning of the Nudibranch
has begun. I believe from what I have read that these are Aeolid Nudibranch but
if you can verify I could not find many definitive pictures on the link for
these (http://www.wetwebmedia.com/MontiNudiF.htm).
I just want to make sure I have the right plan of attack by making sure I am
reading about the right thing. I have not seen a single one of these Nudibranch
on any other SPS or LPS I have (although I will continue to check daily).
Thank you!
Esther
<There are a few approaches... I'd be reading, and pronto. Bob Fenner>
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Montipora Eating Nudibranchs
6/1/15
Hi Bob,
<Hey Robin>
For a couple months now I' be having problems with my Montipora corals.
At first I thought it was something environmental or bacterial as I began to see
what looked like bleached, degrading coral flesh on the edges of my Montis. I
religiously dip any frag that goes into my tank so a parasite had not even
crossed my mind.
<Mmm; some dips, procedures are better than others (by far); and none are 100%
effective over time...>
Today I was getting ready to do my usual tank maintenance on the 120g reef and
started by blowing this fuzzy white stuff off the Montis with a turkey baster.
Suddenly as the stuff was floating away I noticed some of it was wiggling and my
heart sank. They were Monti eating Nudibranchs.
<Arggghhhh! VERY hard to eliminate... requires utmost patience in isolating ALL
colonies, systematically dipping.... perhaps breaking off new culture pieces and
abandoning larger in big facilities... Do you know Morgan Lidster of Inland
Aquatics? I'd have you chat w/ him. Have bcc'd him here>
Everything I've read about them here and elsewhere does not bode well. I have
some large encrusting colonies on huge rocks that would be very, very difficult
to dip and even harder to quarantine. What should I do???
<Move the Montipora/s, VERY carefully observe them; dip enroute, scrubbing or
breaking off all suspicious areas... Place in NEW, known clean systems...
utilize Labrid eaters there.>
Thanks,
Robin
<Oh, do see WWM re what we've accumulated re:
http://www.wetwebmedia.com/MontiNudiF.htm
Bob Fenner>
Re: Montipora Eating Nudibranchs 6/2/15
Bob,
Is there any wrasse in particular that is better for the job than another?
I already have a Six Line in the tank and he either isn't eating them or can't
keep up.
Robin
<For function, I'd try the Lined genus. BobF>
Re: Indian Ocean sps Zoa reef flat biotope tank... Super
Coral/anti HH dip formulae! 9/14/13
Hi Bob
You said "had i devised the formulation)"
What would the formulation be for getting rid of the eggs of Montipora
eating Nudibranch ?
I used CoralRX for 20 min with recommend strength solution.
Can you refer me to a commercial dip or even send some of your special
formulation please? Would be more than happy to cover any charge you
would have in mind :)
<Ahh, only speculating re the desired effects of such a "potion". The
mixes I've used for decades for acclimating/moving Scleractinians
(mostly collector to wholesaler shipments) include slightly depressed (a
thousandth or two) specific gravity, the addition of hexose sugar and a
large "dose" of iodide-ate. This is gone over a few times/places on WWM,
in articles and
presentations of mine. Bob Fenner>
Cheers
Ranjith
white feather worms... Nudibranchs eating
Montipora - 4/19/10
<Hi Randy>
I have a 240gal salt water tank. I have noticed recently that I have
these little white feather like worms eating my green Montis. what are
they?
<Mmm, these could be Nudibranchs. Try a google search on
'Montipora eating Nudibranch'. These are difficult to eradicate
if so, the only sure-fire way I know of is manual removal every day for
two-three weeks>
How do I get rid of them?
<Posted. With difficulty. Iodine dips do not work.>
I can not find any information on them anywhere.
< http://www.wetwebmedia.com/corldisart.html>
Please help before I lose my green Montis and they go to some else to
eat.
<Have battled these myself with this method and won. Simon>
Montipora-Eating Nudibranch Question -- 02/21/09
Hello, <<Hi Jeremy>> I unfortunately have Montipora eating
Nudibranchs. <<Ugh'¦ I have dealt with these pests in
the past 'very destructive and not easy to eradicate>> I
have some encrusted Montipora that I won't be able to completely
remove from my tank. <<Then sadly, these will likely be lost.
Though you could, as I'm sure you are aware, frag them up and
remove to quarantine for inspection/treatment>> I have set up a
QT tank and my plan is to remove the Montipora that I can and frag the
ones that I can't remove and move them to my QT tank. <<Ah!
Yes>> I will dip them in Revive every couple days to try to kill
the Nudibranchs. I understand the dip won't kill the eggs but I am
thinking if I dip every couple days for an extended period of time I
will get them all. <<Maybe so'¦ But do also inspect the
undersides of the corals daily and remove adults/eggs as you find
them>> I am sadly going to have to let nature run it coarse on
the Montipora I can't get out of my tank and hopefully starve the
Nudibranchs. I have read that these pests can live two months without
food. <<I too have heard they can/will enter a dormant
stage 'but I can also attest that without a food source they
will decline/cease to be>> I have two questions, how long should
I keep my Montipora in the QT tank and is Revive an effective dip for
the pests? <<I would give the system a good two weeks after the
last of the remaining Montipora is gone from the display. Then I would
add a sizeable frag of Montipora (choose a species the Nudibranchs
'especially' liked if possible) to the display and inspect this
frag daily for re-infestation. If in another two weeks the Nudibranchs
don't show up on this frag, then it's likely you can return all
your Montipora to the display without fear. As for the dip'¦
The Revive is probably fine, nothing is likely to get everything as you
stated 'but I would also try Tropic Marin's Pro-Coral Cure
as this iodine-based product may well act differently/more effectively
on the Nudibranchs than the plant-based Revive. But only one way to
find out'¦>> Thanks for your help! Jeremy <<Happy
to share. EricR>>
Re: (Follow up: to Eric Russell) New solution against
Monti eating Nudis... New Weapon In The Fight Against
Montipora-Eating Nudibranchs -- 03/10/08 Hi Eric! <<Hiya
Dominique!>> I just made this discovery. Using camel shrimps
(Rhynchocinetes durbanensis) to fight Montipora eating Aeolid
Nudibranchs. <<Really?>> Never heard of that trick before.
<<Me neither 'though I must mention, I don't
consider these shrimp 'reef-safe' at all>> Very
interesting, have a look:
http://www.korallen-zucht.de/index.php?article_id=52&clang=1
<<Ahh! A shrimp stocked 'cleansing tank' separate from
the main display 'and utilized like a hospital/treatment
tank 'though for a much shorter time period. Keeping a small
tank with a few of these shrimp in it should be a simple thing; and an
interesting display on its own to boot!'¦ Very cool!>>
Ciao! Dominique <<Thanks so much for the input, my friend.
Prendere cura! EricR>>
Nudibranchs, as pred.s on
Acroporas -02/20/08 Hello crew, <Howdy> I
very quick question for you. I have gotten some information from my
supplier and would like some help. I have purchased a lot of various
Acroporas in the past, (cultured only). My recent purchases have
somewhat intrigued me. All the Acroporas, are dipped and placed in
quarantine for 6 weeks. No matter what. However these corals are dying
from the bottom up, and from the tips inward. After contacting my
supplier he claims there is a huge problem with parasitic Nudibranchs
industry wide and manufactures are scrambling to find a solution that
will kill the Nudibranchs and their eggs. How you any information on
this. I have sent some die off pieces to a lab friend, so I do not have
any pictures yet. Thanks, I appreciate any help. <Hmm... AEF usually
eat/kill from the base up and out. If your corals are dying from the
tips in, that sounds more like a different problem. In any case, this
is my favorite page/site on AEF: http://www.melevsreef.com/aefw.html
You can see from the pictures what an infected coral looks like and how
the infestation progresses. Another good article...
http://reefkeeping.com/issues/2007-09/mc/index.php> Ann Marie
<Best,
Sara M.>
Best Predator For Montipora Eating Nudibranch?
-- 12/12/07 Hi! <<Hello Dominique>> What would be
the best predator against Montipora eating Nudibranchs (Aeolids)?
<<This 'ideal predator' is likely another
larger/different species of Nudibranch...and probably not readily
available to the hobby>> Is it very likely to help? Very
importantly, is it safe around small shrimps such as sexy
shrimps? <<I've found little, in my experience, that
will help with battling these pests. Even prophylactic dips
seemed more harmful to the already stressed corals than the
Nudibranchs...and although freshwater dips did kill the Nudis,
they also killed the corals>> Would the six line wrasse
(Pseudocheilinus hexataenia) be a good choice? <<Not in my
experience. This and a couple other wrasse genera I've tried
(Halichoeres, Cirrhilabrus) did not seem interested at all in
these small pest Nudibranchs>> Any risk that this wrasse
eats sexy shrimps...? <<Is a possibility>> One last
thing, is it going to doom my mandarin (food competition)?
<<The Pseudocheilinus will out-compete the mandarin, and
unless the system is large (more than 100g), will also likely
deplete the available food supply>> Many thanks! Dominique
<<I'm afraid I don't have a simple answer for your
problem. You can try manual extraction with tweezers (very
tedious...and they multiply very quickly) and blowing/clearing
the Nudibranchs from the affected corals with a turkey baster.
Both of these tactics will work best if the corals can be removed
to a bare-bottom quarantine tank to facilitate siphon removal of
stray/blown-off animals/egg strands. I have seen these
Nudibranchs 'cycle-out' on their own after a while, and
without eating/killing 'all' their prey food
items...though most all small colonies were lost. Do also check
the reef forums (Reef Central, reefs.org) and see if someone
there has had any success eradicating these pests. Regards,
EricR>>
Re: Best Predator For Montipora Eating
Nudibranch? -- 12/12/07 Thanks for the reply. <<Sorry
it wasn't better news>> It's a depressing
situation. <<Agreed 'though I must mention, it may
have been avoided with quarantine>> I just read some people
saying the six line wrasse helped them. <<Is
possible>> I am skeptical about that given what you already
told me. <<I can only relate my experience and the
experience of others I have known>> So far it seems to eat
a single species. <<The Nudibranch? Yes, it is quite common
for these creatures to feed very selectively 'sometimes
even only on a single prey species>> Even moved to the
other end of the tank to eat some more of it while there was
another Monti species in the vicinity. <<My experience with
these Nudibranchs was that they fed only on the plating and
encrusting species of Montipora'¦and completely ignored
M. digitata>> But I don't know what they'll do when
there is nothing left of that species they like.
<<Hopefully they will just 'fade away'>> I
also just read that they should eat all Montipora species.
<<I disagree'¦ Some seem quite specific in their
diet. Hopefully you will be lucky in this regard>> My tank
is Montipora dominated. If they wipe out my colonies of digitata
I think I may go out of the hobby. :( We shall see... Thanks
again! Dominique <<My fingers are crossed'¦ Am
hoping, betting you will be around for a while [grin]. Good luck
my friend. Eric Russell>>
R2: Best Predator For Montipora Eating
Nudibranch? -- 12/13/07 Am more relaxed about it today after
a night's sleep, but was a bit freaking out yesterday. :)
<<No worries re the 'freaking''¦ And
I'm glad you feel better>> For sure you are right about
quarantine, but there is one thing: the Nudis *appeared* just two
months (exactly 57 days) after introduction of the new/latest
coral in my tank. Is that not amazing!? <<Hmm,
interesting'¦ Perhaps there was an incidental
introduction/hitchhiker (Nudibranch or eggs) on an added piece of
rock, macroalgae, even a fish'¦>> So to be bullet
proof (at least with Montipora eating Aeolid Nudibranchs) I guess
one has to do a three month quarantine. <<Mmm,
well 'not really practical, eh?>> Ok, will report
to you on the final outcome in a few months... <<Please
do!>> Thanks for your support Eric! Dominique <<Is my
pleasure to assist. Eric Russell>>
R3: Best Predator For Montipora Eating Nudibranch? (Update)
-- 02/20/08 Hi Eric, <<Hiya Dominique!>> Just to
let you know about the final outcome of the Montipora eating
Nudibranch invasion. <<Ah, okay!>> You were right
about how specific they are in their diet. <<Indeed>>
They do seem to be impossible to remove from a tank until there
is no more food for them. <<Yep>> They also can move
to the sump easily to follow their prey if one naively
tries to hide a piece down there... <<Ha! Sorry, I know
it's not funny, but'¦>> But they only eat
capricornis, <<At least this particular species>> not
even other plating Montipora. <<Mmm'¦'quite
specific' indeed>> In fact there is a nice piece in my
tank I assumed to be a capricornis as it looks very similar and
was sold to me as such, but the Nudis make the difference.
<<I see>> I made a little research since then and ID
it as M. undata. <<Oh? Neat'¦>> So only two
small/medium sized (capricornis) corals were affected in the end:
nothing happened to the many digitata, danae, undata and nodosa.
<< Yay!>> So I won't be selling my tank after
all... ;) Dominique << I'm pleased you've decided
to stay in the hobby 'and I thank you much for the
update. Cheers, Eric Russell>>
Re: (Follow up: to Eric Russell) New solution against
Monti eating Nudis... New Weapon In The Fight Against
Montipora-Eating Nudibranchs -- 03/10/08 Hi Eric! <<Hiya
Dominique!>> I just made this discovery. Using camel shrimps
(Rhynchocinetes durbanensis) to fight Montipora eating Aeolid
Nudibranchs. <<Really?>> Never heard of that trick before.
<<Me neither 'though I must mention, I don't
consider these shrimp 'reef-safe' at all>> Very
interesting, have a look:
http://www.korallen-zucht.de/index.php?article_id=52&clang=1
<<Ahh! A shrimp stocked 'cleansing tank' separate from
the main display 'and utilized like a hospital/treatment
tank 'though for a much shorter time period. Keeping a small
tank with a few of these shrimp in it should be a simple thing; and an
interesting display on its own to boot!'¦ Very cool!>>
Ciao! Dominique <<Thanks so much for the input, my friend.
Prendere cura! EricR>>
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Nudibranchs, as pred.s on
Acroporas -02/20/08 Hello crew, <Howdy> I
very quick question for you. I have gotten some information from my
supplier and would like some help. I have purchased a lot of various
Acroporas in the past, (cultured only). My recent purchases have
somewhat intrigued me. All the Acroporas, are dipped and placed in
quarantine for 6 weeks. No matter what. However these corals are dying
from the bottom up, and from the tips inward. After contacting my
supplier he claims there is a huge problem with parasitic Nudibranchs
industry wide and manufactures are scrambling to find a solution that
will kill the Nudibranchs and their eggs. How you any information on
this. I have sent some die off pieces to a lab friend, so I do not have
any pictures yet. Thanks, I appreciate any help. <Hmm... AEF usually
eat/kill from the base up and out. If your corals are dying from the
tips in, that sounds more like a different problem. In any case, this
is my favorite page/site on AEF: http://www.melevsreef.com/aefw.html
You can see from the pictures what an infected coral looks like and how
the infestation progresses. Another good article...
http://reefkeeping.com/issues/2007-09/mc/index.php> Ann Marie
<Best, Sara M.>
To Bob Fenner please (micro-organism
ID) 8/27/06 Hi Mr. Fenner, <Dom> Hope
you're well. I recently got a new Montipora capricornis and it
seems to do doing very fine overall. I already see some growth and
the already nice colors are improving. But, in a specific area it
started to bleach slowly. It's still progressing and I saw some
1-2mm pure white threads on the bleached areas. I cant see them
moving. I took a sample and made a picture under microscope (please
see attached file, magnification 40X). It doesn't move much
under the microscope, only what I presume to be the head (top right
corner on the picture) was doing a slow searching motion from side
to side. Obviously its a worm and it looks a bit like a lamprey
(the mouth for example) and it looks like it has a bunch of eggs
attached on two points along the body. Can you ID it and can you
give an advice on how to deal with it? Can it parasite a fish as
well? <Highly unlikely> Many thanks! Dominique <Mmm, might
be a trematode... maybe an "intermediate" form of a
Polychaete species. Predaceous, not parasitic if so. There are
quite a few possibilities:
http://64.233.161.104/search?q=cache:9XOLiCgqBC4J:www.advancedaquarist.com/issues/apr2002/appendix.
htm+worm+predators,+parasites+of+montipora&hl=en&gl=us&ct=clnk&cd=5
Based on its apparent morphology... The "basic" or S.O.P.
for removal and prevention of such predators is best outlined here:
http://www.liveaquaria.com/general/general.cfm?general_pagesid=351
Bob Fenner> |
Re: To Bob Fenner please (micro-organism ID)
8/27/06 Hi Mr. Fenner, I did a Lugol's dip and
discovered the real culprits: Nudibranchs (the worm I sampled
probably has nothing to do with my problems after all,
coincidental...(?)). They look exactly the same as those on the
link you sent me. <Ah, yes... what you had thought were
"eggs" were actually "naked gills"> I did a
search on the net and found quite a few info but not very
encouraging. In a forum Eric Borneman said there is no solution at
all to that problem and that even Levamisole or Tetra Oomed
doesn't really work. Some say they do work so I was willing to
try anyway but they are both impossible to find. If you have a
different opinion or hints please let me know. Thanks again !
Dominique <Physical removal and the search for a designated
predator... Bob Fenner> |
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Montipora Eating Nudibranch Predator? -
05/26/06 Hello WWM staff, <<Hello Stephen> I recently
noticed a small number (at least what I could see) of Nudibranchs
consuming various species of my Montipora. <<Mmm, very bad...and
their numbers are higher than you realize>> This was very
disappointing as I have gone through a QT for everything, but obviously
something slipped by my inspection. <<Indeed>> Over the
past 3 weeks I have moved most of my Montipora to a frag tank where I
inspect and manually remove the adults and eggs at least every other
day. <<Prolific breeders, I would do this daily...if you're
serious about eradicating the Nudibranchs>> Finding very few now
and found none yesterday! <<Keep checking...a few weeks
quarantine in order here>> I do however have 2 large colonies of
M. digitata that I can not remove completely as they have encrusted
large rocks at their bases. <<Different species about
(Nudibranchs), but my experience with these critters is they showed a
definite preference for the plating (e.g. - M. capricornis) and
encrusting (e.g. - M. danae) Montipora over the branching
varieties>> Just yesterday I noticed 1 Nudi at the base of one of
these colonies (Where there is one, I'm sure there are more).
<<Yes>> After dispatching this Nudi I inspected as best I
could and can not see any more. <<Again, in my experience, once
the food source is removed they tend to "disappear"
quickly>> So having found this in my display still and not being
able to easily remove all of the Montipora, is there a fish predator
for these guys that would make an appropriate addition to a community
reef tank for a 90gal? <<Not that I'm aware...for
sure. Some of the reef-safe wrasses "may" eat the
Nudibranchs, but I have never witnessed/heard confirmed reports of
this. If you wish to try, a wrasse from the genus
Halichoeres might be a good choice>> I have seen a couple of
species or wrasses mention, but little direct discussion.
<<Indeed...I once experienced and episode with these
Nudibranchs...I had wrasses from four different genera in my tank
(including Halichoeres) but could never discern any of them feeding on
the Nudibranchs>> Thank you, Stephen <<Quite welcome,
EricR>>
Monti Eating Nudibranchs and predatory starfish I 8/11/04
Dear Bob Anthony, <cheers, my friend> First and foremost I wanted
to say thank you for everything you do. I believe it can truly be said
that this phenomenal hobby has advanced so much over the years because
of your dedication to it! <thanks kindly... it is a labor of
love> I had a quick question if you don't mind, and also wanted
to bring to your attention an interesting experience that occurred. I
am of the opinion that everything in the wild has its purpose, and will
not try to eradicate anything unless it is truly harmful. <agreed...
and yet, there is a joke somewhere in there about politicians. Well
give lawyers a pass on this one> I have a fairly large system with 8
plating Montis in it. I went on vacation and when I returned I noted
two plating Montis were suffering severe tissue loss. I thought the
issue was more water quality related, particularly since my calc
reactor had been down for several weeks and the filter socks needed
cleaning. Despite water changes and dosing with Kalk, the affected
Montis continued to RTN. I had heard of these little predatory
Nudibranchs, but did not think there was a chance I had them. I fragged
one of the Montis, and what do ya know there they were. Tons of them
(to be honest, even though I have an obvious degree of hatred for them,
they are fascinating). <Arghhh... you have not been diligent about
quarantining your livestock my friend. 'Tis why you have this pest
now. Do QT all things wet in the future - live food, live sand and
rock, snails, corals, fishes, everything! <G>> My problem is
the effected colony encrusted hardcore onto a large piece of rock,
there is no way I can pry it lose. I am suspect that these suckers are
concentrated under the base. Is there anyway to rid of these things?
<they are very difficult indeed... do check the extensive threads on
this topic at reef central. I cannot say the bad news any better than
they have :p> Is there anything in the wild that eats them?
<certainly.. but reef-safe? Hmmm... spec at this point. Some have
said various wrasses and dragonets. None excel though reliably> I do
have one CBB, but I would think some form of reef "safe"
wrasse would be better. <perhaps... Tamarins or small yellow/green
"Coris"> Also, wanted to mention in the past there was a
dispute as to whether these little brown starfish we all have actually
eat SPS (i.e. GARF). <Asterina species... and yes, I have read the
GARF info. I do not believe it is accurate.> I had been in the SPS
end of things and never had an issue so I was not concerned. Indeed
they do eat SPS, the other colony I referred to above had tons of these
brown starfish on the underside, right were the run line was on each
plate. What is stranger, I have tons of across and non have been
affected. Looks like it is time to buy a harlequin (there are plenty of
these things to last the harlequin quite a long time). As
always thanks!!!!!!!! <do check out my take on Asterina and other
sea stars in the recent article on reefkeeping.com from a couple of
months ago. Best regards, Anthony Calfo>
Monti Eating Nudibranchs and predatory starfish II
8/11/04 By
the way, I am curious (from a scientific perspective) as to whether
these predatory Nudis show a preference for certain species of
plating Monti, or whether this is just a random event. <there are
quite a few opisthobranchs that are obligate on one species of
invertebrate or very limited (by genus usually) otherwise. There are
lists of slug species and their prey available on the web. DO check out
resources like the SeaSlug forum. We also have an extensive list of web
sites and references on Seaslugs in the bibliography of our book
"Reef Invertebrates" by Calfo and Fenner 2003> What I
think is strange is the Nudi's have only affected one colony, none
of the others have them (at least not yet). It would be neat to take
frags of say 10 types of plating Monti, and see which species they show
a statistically significant preference for Thanks <please do take
photos and tell us of your findings if not write an article.
Anthony>
Something eating SPS - Montipora Anthony, happy
holidays and hope all is well with you. <Adam here
today. Anthony bumped this over to me since I just dealt
with this problem in my own tank.> I noticed one of my recent frags,
a Montiporas Cap, that is purple in color bleached around
the edges about a quarter of an inch. This is more then
the normal white tips from growth. I attributed
this to a drop in Alk while I was adjusting to my winter evaporation
rate. <I did pretty much the same thing. I
attributed it to water quality, did some water changes and never really
inspected the coral closely.> However, I have noticed a small white
spiral looking thing on the white part of the coral. Looks
almost like a very small white fan worm (at least the ends of the fan
worm anyway). <The critter you saw is an Aeolid
Nudibranch. They seem to becoming quite common in the hobby,
likely from frag trading. They seem to favor plating
Montiporas, but will move on to branching forms.> I also noticed a
small white area on my established, thriving purple
cap. Could this be a bug or something? Any ideas
or am I just seeing things. <The white spots are where
the Nudis have eaten the coenosteum (tissue between polyps) of the
coral. Unfortunately these are very real and quite difficult
to get rid of. Manual removal is the only way to do so
without significant risk of killing the coral. You will have
to remove the infested corals every day or couple of days and pick or
scrub off any Nudibranchs or eggs. It may be best to this in
a bucket of tank water since the critters tend to collapse under their
own weight and become difficult to spot out of the
water. After you are 100% sure you have eliminated them,
continue to check your Montiporas at least weekly. I
continued to find one or two a week for about a month.> Thanks
<No Sweat, and best of luck! Adam> Andrew
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