Meant, crabs and snails and such for inverts.
Anyways couple of reasons an elegance will recede it's flesh like that. In your case, if you have crabs, they could have injured the flesh while climbing on it to steal the LPS pellets you fed it. Happened to me once. Or you could have had a temp swing it didn't like. Or maybe it's the lighting it does not like. So many variables. We need more info
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