Hermit Crab failure - I am become death...destroyer of crabs

reeferstudent

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Hi Everyone, first post. I have had a reef tank now for almost one year, my only fish are a clown pair, and a clown goby who is my favorite. I also have a few stars, and nas and troch snails. I recently went on vacation, and returned to find my corals dead and choked out by long hair algae and aiptasia. I looked online and ordered 5 blue leg hermit crabs to take care of the algae. My salinity is 35% or 1.026, and my KH is a little low sitting at 7.8. But my new peppermint shrimp I bought last week seem to be thriving, have molted succesfully.

Onto the matter at hand, I acclimated my new hermit crabs over a one hour period, temperature and drip acclimate. I add them to the tank and they immediately started chowing down on the hair algae. I came home from work last night and my peppermint shrimps were feasting on one in their den. Weird i thought, but i looked online and the consensus was that they are not capable of killing hermit crabs, so i thought it must have died and they did what scavengers do. This morning i woke up to find them with another one, and the snails had joined the party, i checked them all and all the shells were empty except one, which when i turned over, out plopped what i assumed to be a dead crab, no color and had no claws. As i went to, very sombrely and respectfully, put him in the toilet grave, i noticed him curl up and twitch a little. I ran back to the aquarium and put him under a shell in a safe nook. Now I don't know if they really died, or if they were molting and the shrimp grabbed them and ate them in a weakened state. I don't know what else i could have done to acclimate them better? I am stumped and depressed to be responsible for these deaths.

Does anyone have any theories or similar experiences? I need to learn what went wrong, are the shrimp to blame? I won't order anymore until i get to the bottom of this, also i live in china and they are very expensive here to be just shrimp snacks. Thanks for reading my essay.
 

reefsaver

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Possibly high nutrients or a sharp change in water parameters stressing the Hermit. Do you have any results for your NO3 (Nitrate) and PO4 (Phosphate)?
 
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reeferstudent

reeferstudent

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Possibly high nutrients or a sharp change in water parameters stressing the Hermit. Do you have any results for your NO3 (Nitrate) and PO4 (Phosphate)?
Thanks for the reply, yeah , I am at work now so dont have my logbook, but NO3 was at 10 or lower, and phosphate was at 0, which I remember being worried about being too low. My water temperature is sitting at around 27-28 each day, I bought cooling fans but they only lower it from 30 down to 27/28. Chinese summer is brutal. I also have a ceiling fan directly above the tank turned on 24/7
 
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reeferstudent

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so...an update... I have learned another expensive lesson.... Thismorning I decided to calibrate my refractometer, assuming that in the last couple of months it may have wavered by .01... It was off by .08! I've been putting 1.033 water into my tank for god knows how long. Would explain my dead crabs and corals I think... the clownfish are still fine...hardy motherf's but I am surprised the clown goby and shrimp also survived my blunder. On the plus side... the high salt seems to have killed my aiptasias ....silver linings. I am water changing now back down to 1.026 (35%) and will try a single hermit crab again in a few days. I will let you all know the result.
 

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