If you put all those crayfish in the same tank, they will fight and the weaker ones will get their claws and legs ripped off... its very common in tanks without much suitable hiding places as the crayfish have no place to retreat and hide so they have to constantly fight for territory.
The period after molting is usually when the crayfish shell is still soft, so it will tend to get injured more easily. That probably explains why it has been losing battles and getting "disassembled".
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