Help; is my hermit crab dead?

I had and still have many hermit crabs. Recently, i bought three new ones from PetsMart. One acts like it lived in my hermit crabitat all its life, one never comes out when i hold it, and one is just limp. I put this crab in an ISO tank just in case it was molting. I noticed it has lost two legs; probably because... show more I had and still have many hermit crabs. Recently, i bought three new ones from PetsMart. One acts like it lived in my hermit crabitat all its life, one never comes out when i hold it, and one is just limp. I put this crab in an ISO tank just in case it was molting. I noticed it has lost two legs; probably because stress. I don't smell a strong fishy odor, just the regular hermit crab smell. It's not completely out of its shell, yet it is really limp. Is my hermit crab dead?
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