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Old 11-04-2003, 10:58 AM   #1
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Hermit Crabs Dying

Well, my water parameters are right on the money, zero ammonia, zero nitrites, 15 nitrates; my hermit crabs seem to be dying slowly. Every few days or so I will see one out of it's shell just dead.

The tank is still fairly new, probably 2 weeks out of its cycle. I've done two large water changes already, but still have some brown algae growth. So there is technically stuff for the crabs to munch on. Why are they dying?
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Old 11-04-2003, 11:01 AM   #2
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What is your SG?

Mobile inverts really need to have a SG of 1.025-1.026 in order for them to survive for long periods.
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Old 11-04-2003, 01:10 PM   #3
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an SG of 1.025 to 1.026? Isn't that really high? Will my fish be able to survive that? I thought you wanted your SG at around 1.023!
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Old 11-04-2003, 01:22 PM   #4
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Natural reef environments have a lot higher salinities and temps than most peeps think

I raised mine from 1.024 to 025-026 and raised temps from 80 to 83 or so after reading the article about natural reef environments carefully.

I got this article from ReefLady I think it is great.

http://www.animalnetwork.com/fish2/a.../1/default.asp
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Old 11-04-2003, 01:27 PM   #5
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I thought you wanted your SG at around 1.023
This is a general area for salinity and is in no way too low for the Hermits to live a long life...

Fish will live in higher salinity however, they have to process the salt more. I don't know how it affects the long term longevity of them..

Most people keep there salinity at 1.025 in a reef environment and has not shown any bad effects... I have tested Sea water out off of the coast here in Florida and it is around 1.023....where I frequent, it is 1.024 fairly constant...

Hermits need larger shells to move into... When the molt, they grow bigger...If they cannot fit into their old shell they are left to pick another. If there isn't one, they are subject to predators...and can be killed..let alone die from the molting process in itself.. It is a very stressfull thing to them when they molt....
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Old 11-04-2003, 01:32 PM   #6
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I should have worded my response like Timbo did. Yes, 1.023 is a good salinity for just about anything and yes hermits will live in it. But I think over the long run, running a higher salinity for inverts will benefit them more than running at a lower salinity.

FYI, I run my tank at 1.025-1.026. From the reading I have done, these are the SG of quite a few of the oceans's reef.
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Old 11-04-2003, 09:12 PM   #7
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You said your water peratmeters are "right on the money"...but your nitrates are at 15ppm. That is a little high, and possibly why your hermits are dying. Nitrates should be less than 0.25ppm or immeasurable, for everybody for be comfortable, especially inverts.
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