hermit crabs are dieing - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 27 Old 11-19-2008, 02:17 AM
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Hmmm... I don't hear a lot about hermit crab maladies... In my experience they are really hardy and seemingly impervious to disease (of course that idea is completely ridiculous, but I do know they can go through some rough stuff) I'm sure someone has written a book on hermit crab care... Maybe check your library for some books?

Do you have sufficient empty shells of varying sizes and shapes in there for them to grow into?

Given that your tank is almost 1 yr old I'm assuming you've got plenty of growth on your live rock and things for the hermits to eat, but is it possible that the competition for food is too high? How many crabs/snails/shrimps/etc. do you have? Maybe they aren't getting enough, or more likely the wrong types of food? Try some sinking pellets?

Good luck! I love hermits... Hopefully they recover well.

29 Gallon Reef 20G FW lake tank
2 Ocellaris clownfish 2 Pumpkinseed sunfish
1 Sixline wrasse A lot of driftwood
1 Peppermint shrimp A lot of foliage
1 Longspine urchin Penguin 330 power filter
Various soft corals, LPS, & SPS.

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post #12 of 27 Old 11-19-2008, 02:30 AM
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Quote:
Originally Posted by ajmckay View Post
Good luck! I love hermits... Hopefully they recover well.

some good advice however i do not think dead hermit crabs recover well


what kind of water do you use? is there any possible way copper got into your tank? or was there to begin with and enough leeched out? what other inverts do you have? and how well are they doing? are you sure its not a molting?
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post #13 of 27 Old 11-20-2008, 02:54 AM
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Originally Posted by onefish2fish View Post
some good advice however i do not think dead hermit crabs recover well


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post #14 of 27 Old 11-21-2008, 01:43 PM Thread Starter
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I use r/o water for water changes, tested for copper and it is zero. I do use sinking pellets and they do eat it. Calcium seems to be lowering slowly, It is funny because I use to dose every couple of days now I haven't dosed in two weeks and it is still high. I have a lot of empty shells inside the tank.

I have 3 shrimps, 6 turbo snails, now down to 5 hermit crabs (red, blue, haloween crabs) 2 clownfish, 1 yellow tang, emerald crab, porcelain crab,
and corals.


Maybee it is my test kit that is the problem?
It is only 6 months old (API drip test kit)
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post #15 of 27 Old 11-21-2008, 09:04 PM
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what are you feeding the tank?

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post #16 of 27 Old 11-25-2008, 10:24 PM Thread Starter
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I got sinking pellets, sea weed, and some flakes for the fish.
for corals i use Kent Marine Phytoplex (5 times a week)
and Kent Marine Zooplex (2 times a week)

Did anther water change last night and todays readings:
Calcium 660 (have not dosed in about 3 weeks now)
-->checked with 2 test kits
KH 100
Salt 1.022
ph 8.4
amonia 0
nitrite 0
Nitrate 0

Also I purchased Bionic calcium and alkalinity additive last night but have not used it yet.

just read this article --might be good help
http://www.advancedaquarist.com/issues/nov2002/chem.htm
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post #17 of 27 Old 11-30-2008, 07:31 PM Thread Starter
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Tested calcium today at it is still at 660, Alk at 100 so I dosed with bionic Alk buffer to bring it up a little.
Can something in my tank give off calcium, I have not dosed in about a month.
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post #18 of 27 Old 12-02-2008, 01:28 PM
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Maybe there is something wrong with your RO water (meaning the machine doesn't remove calcium properly)? Did you check the RO water for calcium before adding it to the tank?
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post #19 of 27 Old 12-02-2008, 01:36 PM Thread Starter
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I did not check r/o water, but I checked pre mixed r/o salt water and it was around 200.
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post #20 of 27 Old 12-03-2008, 11:10 AM
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Wow. This is a fun thread. Can you post some pictures? I know it sounds funny to ask, but it is easier to brainstorm when I can see the tank.

Did i understand correct that your calcium level in the r/0 saltwater is 200ppm? Did you also test pH and alkalinity of this water?

If Calcium is >600 ppm you will have low alkalinity. What EXACTLY are you adding to tank, how often, at what dose, and at what readings?

Also, this is extremely important. We need phosphate test results to properly discuss unusual calcium issues. Test for phosphate.

Finally, on the hermit crabs. Maybe this is nothing, but...
Calcareous substrates absorb copper and can release it back into solution when the pH drops. High Calcium will cause pH to drop. Even undetectable levels of copper could cause the behavior you describe in your hermits.
Have you EVER dosed copper before in an aquarium that used this same substrate?
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