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Feeding large hermit crab
5/28/14 Queen Conch and Hermit Feeding -- 12/19/11 Hermit Crabs/Feeding 7/14/10 Supplement Diet Marine Hermit Crab 10/10/09
Thinstripe Hermit Crab (Eating Everything!) - 05/09/08 Hi there, <<Hello>> Firstly I must say I use your site regularly (it's great) and usually find an answer to any questions I have, however, on this occasion I have come unstuck! <<Oh?>> I currently have a Red Sea Max 34g tank with full reef setup. At the beginning I was duped into believing that a Thinstripe hermit crab would be a suitable reef tank-mate. <<Hmm…I honestly don't consider "any" hermit crab to be reef-safe…and many species can be downright destructive>> The conditions in the tank a perfect and as a result the hermit has grown very well, a little too well and is getting quite big, at least a couple of inches. <<This is a problem, in my opinion>> He is very boisterous, knocking over corals and others things plus he likes to rearrange the tank now and then. <<Another negative aspect…aside from their opportunistic feeding habits>> This behavior clearly upsets my corals especially the Goniopora, Pulsing Xenia and polyps. Lately he has been getting onto the Sarcophyton sp (about 5-6inches wide) and eating its' tentacle thingies (not sure of the technical term!) <<Polyps>> At which point it closes up and recently started eating the tubes of the fan worms, nipping at the finger sponge and I saw an end of the pulsing xenia floating about as well (maybe he had a go at that?). <<Best to remove this very predaceous hermit>> You don't think it is a food source problem, he is just very opportunistic! <<Indeed>> Clearly I need to remove him from the tank and I am sure the LFS will put him in one of their big display tanks, however this guy (his name is Rocky!) is so cool, he is so much fun to watch so would be reluctant to get rid of him. <<Interesting creatures for sure>> My question is this, is it possible to put him in a separate smaller tank on his own without the need to have all the equipment? (Skimmer, powerheads, lighting etc) I known the Thinstripe hermit is very hardy and can go for long periods out of water so could I get away with a small amount of live rock, standard tropical lighting, standard heater, a simple filter and regular water changes (maybe a small powerhead but I don't think this is necessary)? <<This could work, yes…be careful not to over feed, and make sure you monitor Nitrates and keep them down with the regular water changes…and do also supply some water movement via the powerhead>> Any help much appreciated. Colin, London <<Happy to assist. EricR, South Carolina>> Phimochirus holthuisi...Care and Feeding - 08/28/06 Please, I need your help! <<I'll do what I can>> I have a red striped hermit crab. I have been trying to find information on its feeding and habitat needs but can't find any info on that species in particular. <<Habitat and feeding will be similar to other marine hermits (blue-leg, red-leg, etc.)>> So, I guess my questions are: is it a full-marine animal, <<Yes>> or does it need both water and dry land? <<No>> If it needs some land, does it also need some fresh water? <<No>> And what does it eat? <<Anything that crosses its path (an opportunistic omnivore). If it is in a system with fish/live rock it will get by on the excess fish food/emergent life on the rock. If it is in a system on its own, a couple "shrimp pellets" or a small pinch of marine fish flakes each day will likely suffice>> I've been giving him hermit crab food from the pet store, but it doesn't look like he's eating any of it. <<Please do some research re keeping marine hermit crabs. Please start reading here: http://www.wetwebmedia.com/marine/inverts/arthropoda/crabs/hermitcrabs.htm >> If you could help, that would be greatly appreciated!!! Jon <<Regards, EricR>> Halloween Hermit Crab (Ciliopagurus strigatus) care - 08/26/06 Hi know from reading on your site you don't like crabs in a reef tank but I do have a few. (Crabs & questions) I think my Halloween Hermit Crab is dead I cant tell if he is still in his shell. In the past he has molted and I could swear he was dead but than in an hour he would me moving and by the next day back to his old habits. But this time it's been about four hours. All parameters seem OK PH 8.2 Ammonia 0 Nitrate 10 Nitrite 0 temp 78-82 1.024. The only thing I think of is that I replaced some evaporated water and the salinity went from 1.025 to 1.024 could this be enough of a change ? <Mmm, yes, to effect this behavior, possibly kill Hermits> I have 2 Petrolisthes sp I feed them DT phytoplankton every other day 1 emerald & 6 scarlet red crabs. At night I drop 2 pieces of sinking food tablets in the tank. Is this sufficient food for the crabs there's algae growth green & brown & coral line. Thanks <They will "let you know" if insufficient food is offered... by feeding on each other and the other life in the system. Bob Fenner> About my hermit crabs... and no-no's re nanos... maint. 5/28/06 Hi, guys, I have spent all evening reading your very interesting site. It has already answered many of my questions about hermit crabs. But I would like, if possible, to have a straight answer to the following questions: <Okay> How many hermit crabs do I need for a 24 Nano tank with about 15 pounds of live rock? <Need? None, zero, zip> I have about 13 hermit crabs, 3 snails, and a emerald crab. <Watch this last... can become an "eater upper"...> At the beginning they did an excellent job and cleaned all of my rocks in about a week. My rocks looked superb with beautiful violet and green colorations. But they seem not to be cleaning them as much. Many times I do not even see them. They spend many hours hidden in the rocks! Therefore, the rocks are being covered with red and brown hairy algae which seems impossible to get rid of despite my weekly changes of water, an installation of another power head and reduction of the hours of light from 12 to 9 hours per day. Why are they so shy and disinterested in cleaning the rocks? <Mmm, very likely there has been a "natural" shift in the make-up/preponderance of the algae types/species/groups here... from the more tasty "red and greens" to the less-palatable browns and BGA... and also probable, a shift in food/feeding preference to excess food from scavenging.> Besides the cleaning crew I have two blue Chromis and a rose bulb anemone with its beautiful clown fish. Jeanette <... dangerously crowded... Do be "religious" re water quality testing, water changes... Bob Fenner> Coralline Algae and Hermits a-chomping 5/2/06 Hi Crew and thanks for helping all of us! <Hello back at you! Jodie here once again on this fine and stormy evening.> We have a 30 gallon tank with 30 pounds of live sand and about 40 pounds of live rock. We have 4 very small fish and around 30 hermit crabs. <What kind?> In spite of all of our efforts, we can't get the rocks to "purple" with coralline algae. A year and a half ago, we added a 120 watt lamp. The rocks look darker now, but not purple. My wife has noticed at the local fish shop that the tanks that have nice purple rocks have no hermit crabs. She's convinced our crabs are eating the coralline algae. <She could be right...> I insist otherwise. <...but so could you.> Which one of us is correct so we can settle our wager? <Hermit crabs, especially red-legged ones, could be eating the coralline if they are lacking in food. I would check your parameters first though, before blaming them. Low magnesium levels can hinder coralline growth, as can nuisance algae, poor water circulation, urchins, etc.) Thanks for all of your great advise! <Sorry I couldn't definitively settle your bet. Too many variables for me to make a solid judgment. Cheerio, Jodie> Charlie Snails and hermits - feeding - 04/14/2006 Hello WetWebMedia expert, <Hello! You've got John here this morning.> I first want to say of all the sites I have visited these past 6 months, this is one of my favorite. Very informative and lively exchanges. <Thanks! It's my favourite site too!> My question is a general one about snails and hermits. I am just about done cycling a 125 gallon reef tank (my first) with 110 lbs. of live rock. So far, so good. My water parameters are good and I have oodles of copepods. <Good> Two days ago, I purchased my first live stock- 5 turbo snails, 5 Astraea snails, and 10 (total) blue leg and scarlet hermits. The live rock had a fair amount of algae and other matter, living and dead, on it. I was amazed how quickly these guys devoured the plant material. After only two days, about half of everything has been consumed. My concern is that it appears someone (turbo snails?) is also eating my purple coralline algae. <Not likely, unless you have something like an urchin in there.> Help! Am I imagining this or do one or more of these critters eat coralline algae? Thanks. <Most likely, the coralline is seeing off naturally. It will tend to go through death/renewal cycles like this whenever it suffers a major change. It's normal to expect that some species of coralline would die off during the first few months of a reef tank. Hopefully, it'll come back in time.> Steve <Best regards, John.> Dardanus megistos question 7/23/04 I have a large crab (carries a 6 inch shell) that is starting to worry me. He is in a 20L tank all by himself. Normally he becomes sluggish and stops eating for a week before he molts and then returns to his normal activities and eating patterns after his molt. It has been a little over 2 weeks now since he last ate. He is sluggish and I keep waiting for him to molt.........how long can a molting process/no eating take? Is there anything I can do to help him? There is live rock in his tank and the water parameters are all good.......Thanks for your help........ Janey <Janey, I suspect one of two things... Such a large crab requires a lot of food. Either it isn't getting enough, it is getting enough but (especially considering the relatively small tank) water quality is poor. I would recommend at least 20% water changes monthly as a minimum and be sure that your crab is getting enough food with plenty of variety. Best Regards! Adam> My hermit crab has lost both of its claws! Can it still eat? I have two hermit crabs, and one of the molted. Afterwards it seemed smaller. It had always inhabited the bigger of the two inhabited shells (there are other shells in the tank as well). The other crab looks very robust and is really popping out of its shell. Anyway, I noticed today a claw lying around on the sand, and when I picked up the one that had molted it was missing both claws! <this occurs often from inadequate humidity (have you been misting them with a spray bottle daily? They need this to molt and to breather (!)... humid air to take up oxygen better... like the beach <G>) or from inadequate diet (are they eating a formulated pellet, or improvised diet instead?)> I feel terrible! Can it still eat? <the large claws are not primary for feeding (smaller claws set in next are). No worries.. it can still eat.> Is there anything I can do for it? I am taking it out of the tank and putting it somewhere else because I think the larger one must have been fighting it for the shell. please answer ASAP if there is anything I can do. Thanks. Janet <new claws will grow soon of course. We have some great information in the archives if you care to read it at wetwebmedia.com. Best of luck, Anthony> Red Legged Hermit crabs MR. FENNER IS THERE ANY TRUTH TO THE ALLEGATIONS T. MILLER HAS MADE THAT RED-LEGGED HERMIT CRABS ACTUALLY EAT CORALLINE ALGAE. (Yes... they can, do... perhaps not as a first or desired food item...) I HAVE A REEF TANK THAT I STARTED IN OCTOBER, THAT'S NOT GROWING THIS ALGAE EVEN THOUGH MY WATER PARAMETERS ARE AS FOLLOWS. CALCIUM - 400+ KH - 12 PHOSPHATE - .4 NITRITE - 0 NITRATE - 0 I HAVE APPROX 60 HERMITS AND 25 SNAILS IN THIS TANK (75 GALLONS) MANY OF THE HERMITS ARE THE RED- LEGGED VARIETY. I HAVE CORALLINE ALGAE ON THE LIVE ROCK THAT I PURCHASED AND I HAVE GARF GRUNGE IN THE TANK ALSO. I'M USING 4 PC LIGHTS (96W) 2BLUE AND TWO DAYLIGHT, AND I WAS LEAVING THEM ON 10 HRS A DAY. I JUST CUT THEM DOWN TO 6 HOURS BECAUSE I'M BEGINNING TO SEE GREEN ALGAE. MAYBE YOU CAN SHED SOME LIGHT ON MY INABILITY TO GROW CORALLINE ALGAE. (Could be a few other major possibilities here... a dearth of magnesium... is likely... other algae competing, producing toxins that curtail coralline growth...) THE ROCKS ARE GETTING A GREEN AND GRAYISH COLOR - SIMILAR TO WHAT'S DESCRIBED IN T MILLER'S ARTICLE THAT BLAMES THE RED-LEGGED HERMITS. I SPOKE TO LEROY AT GARF AND HE TELLS ME THERE'S NO VALIDITY TO THIS CLAIM. I'D REALLY LIKE YOUR OPINION AND HELP. (As stated, have seen this behavior, heard of it from other folks who can be believed. Please see the coralline algae, hermit crab sections on our website: www.WetWebMedia.com for more here) THANKS JOE SLAVIK (No need to shout... type in all capitals... Bob Fenner) Rock hermits Hi Bob, I have kept a Dardanus deformis rock hermit (complete with his anemones) for several months now. I love this guy, of course he is in a FOWLR system. He has shed twice, and both he and his anemones have grown substantially. He is currently in about a 2" shell. I have seen him sit his anemones down on food pellets ( coincidence or what ??). <Not coincidence... purposeful feeding of mutualistic symbionts> He is so much fun, but I can't find anyone else who has or has had one. Here's a pic, but he's bigger now. http://www.members.home.net/d.hadford/rockcrab.html Deb Hadford <Very nice... do see this species in the trade occasionally... easily collected at night. Bob Fenner> Hermit crab anemones Hello, how is everyone tonight, well I
hope. <thank you, with the same wishes in kind to you. Anthony Calfo
in your service> I will be doing so so so much better if you can
help me with some info. <I'll tell you what I know and
make up the rest to sound very convincing <smile>> I have a
fairly large hermit crab in my 30gal. long aquarium with an anemone on
it's shell. From Dr's Foster and Smith's website, I figured
out that it's a Calliactis polypus. <Ughhh... fascinating
but tenuous life for the anemone in captivity. I rather wish these
animals were not made available for random impulse purchases. This is
definitely one for the "I should have looked before I leaped"
file. Please do research all animals, especially the unfamiliar before
you acquire them, my friend>> But that's all the info I can
find on it anywhere on the web. I was wondering if you could tell me
what it's lighting requirements are. <actually a heavily
feeding dependant Cnidarian (organismal as absorption)> It seems to
be doing well so far, I've had it a few weeks, and it's still
fully extended all the time. <which means little or nothing to
tell the truth. Most all anemones can hang in there for several months
starving to death while they execute normal polyp/tentacle cycles>
When I feed it, twice a week, it grabs the piece of food out of my
fingers and immediately curls around it to swallow it. <very
good to hear it! Please do continue to deed a wide variety of meaty
foods (4 or more of marine origin) with the hope of keeping this animal
for more than a year... hopefully years!> It also picks up little
bits of "stuff" off the substrate as the crab moves around
the tank, <indeed... lighting is secondary to their feeding
strategy for deriving sustenance> and every time the crab changes
shells, it takes the anemone along. MY biggest worry though, is that
it's not getting enough light because usually during the day, the
crab goes under a ledge and digs into the substrate leaving only the
anemone on top of his shell exposed. <natural again for this
heavily food dependant. Still, quality full spectrum reef lighting is
attractive if not necessary for other live rock and invertebrates you
might have. Bulbs favoring the 6500 to 10,000 K rating would be ideal.
Several bulbs are most likely necessary> As I said, I can't find
any info anywhere on this little guy. Any information you could give me
would be sooo greatly appreciated!!!! <explore the links to
FAQ's from this site... perhaps info inside. Photos of a couple of
hermits with their guests on this page too...http://www.wetwebmedia.com/marine/inverts/arthropoda/crabs/hermitcrabs.htm>
Thank you, Kristen:) <best regards, Anthony> |
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