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One of my Emerald Crabs lost his leg/pincher. I don't know how, but it's definitely off. I thought it was a molt but it was the real deal. I am assuming this will grow back? Should I be concerned?
The claw will not reappear until it molts. The regeneration process occurs under the hardened shell and cannot protrude until the soft undershell is exsposed. Give it time. If your two crabs are battling, this will most likely continue, might be an idea to transfer one to a different tank or return one.
DOH!! just saw the date of the original post. Are you sure this is not a reoccuring problem between the two crabs? It is more than possible the appendage is there but it can take several molts before it regains it's proper size. There is also the possibility it won't grow back if the damage was deep enough.