Crab sheds shell and dies/cripples itself?

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Shetland James

Aquarium Advice Freak
Joined
Nov 18, 2010
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I have 4 crabs in my tank, unsure of what kind they are.

I noticed that one was lying upside down but not dead, and when I noticed I suddenly had a 5th crab in the tank I was a bit confused. Turns out that one has shed its shell (I can't believe how much the shell just looks like another complete crab). Anyway the shed shell matches the one who is poorly and I'm wondering if it may have damaged itself while shedding its shell?

It's 2nd right hand left is sticking up in the air and the other crabs are taking advantage of it, shall we say (one crab was behind it and holding on to the poorly crabs nipper-joints).

what's going on?
 
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