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Doesn’t look like a emerald to me. Might be but might be a gorilla crab or .....?Looks like a molt of a green emerald crab. Didn’t know I had one in my tank either. If it is, definitely beneficial for any hair algae, but could be dangerous for any ornamental shrimp.
I have a similar one. Don't think it's an emerald. From my research appears to be a type of bristly crab. Been keeping an eye on it and so far shows no interest in fish or corals. Has been quite elusive but if I can get him I’d sump him just to be safe.
Agree. Sump it and observe.Definitely not an emerald. That guy has sharp claws, emeralds have spoon shaped claws.
Looks like a gorilla - so sump it.