Why do my Hermit crabs/shrimps keep dying?

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jiffyjhn

jiffyjhn

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The small crab is slowly going back into his shell. The larger one is still alive(poked it with a toothpick and there was movement).
Is it ok if I kept them in the cup and float it in the tank overnight?


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Cantusaurus

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the salinity in the tank is 1.025, I have another established tank that I borrowed a hermit crab from. that tank has 1.021 salinity.


Salt mix is Reef Crystals. I have a 5 stage spectrapure RODI unit
Oh, I see. Yeah I guess that is a big salinity difference, but you did drip for a while. Maybe it was not quite enough, but it is hard to pinpoint the exact reason. Reef Crystals is good. Especially for the price. The mix also has high parameters (Alk, Calc, Mag). So I doubt the tank had an insufficient amount of the elements. Definitely strange as to why they did not do well. Most likely bad luck and it being a newer tank ;/
 
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Oh, I see. Yeah I guess that is a big salinity difference, but you did drip for a while. Maybe it was not quite enough, but it is hard to pinpoint the exact reason. Reef Crystals is good. Especially for the price. The mix also has high parameters (Alk, Calc, Mag). So I doubt the tank had an insufficient amount of the elements. Definitely strange as to why they did not do well. Most likely bad luck and it being a newer tank ;/
The large Hermit lived in my established tank for 4 years. I barely even do water changes in that tank(15% every 3 months or so). The parameters in the new tank is better(much lower nitrates)
 
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LFS near me all have low salinity 1.021 - 1.022. I Guess this means I shouldn't even buy inverts from those stores. or lower my tank salinity?

Actually I should probably check the accuracy of my refractometer. Maybe it's off and the LFS is something like 1.025, which would mean I'm closer to 1.030
 

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Guess you’re kinda stuck. If you want corals you’ll need the higher salinity. Just take it really slow. Probably expect a few losses. Do your best. You’ll get the cuc going. Don’t let a few losses early on discourage you. Sometimes it seems like nothing we can do will make crabs live. Sometimes it’s like they’re made of steel.
 
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update:
I put the large hermit back in the tank on a rock. He started walking around. the blue leg that's out of the shell is still clinging onto his shell but still not going inside. the other blue leg that was lying upside down flipped himself over and is picking stuff from the sand bed
 

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One thing that they told me is that for inverts the salinity is recommended to be at 1.025 or 1.026, seems that you have it at 1.21 or so.

Also a 2 month old tank you will certainly have challenges, heck mine is 4 years and at times i have great challenges, different ones but challenges...seems Algae will get you one time or another...lol
 

lynaea75

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In my experience hermit crabs have trouble righting themselves when they are upside down like that. Is the rock work/sand different in your smaller tank that they are ending up flipped completely over? Or maybe one of them is shell hunting and is flipping them and then they can’t right themselves. Regardless, if you see a hermit upside down or in a weird/tight spot for more than an hour it probably is stuck and needs assistance.
 
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looks to be ok now. out of the 4 hermits I put into the tank. 1 is alive and well. The ones that died were likely due to drip acclimation being too quick for the salinity difference. Not planning to add any more into this tank since the Trochus snails can take care of all the algae on their own. Will do a long drip acclimation if I decide to add any in the future
 
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