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It is below the snail and to the right just a little. The bluish colored thing with the two black holes. I think the holes are mouthes. It reacts when I feed it with chromaplex.
looks like a card of some sorth. i would take it out. i am not a fan of crabs in my tank. i am thinking of takeing all of the hermits out too. they kill each other. but i would say it looks like a crab.