id this crab?

We got this hitchhiker crab inside a piece of live rock/coral a few months ago at a LFS. It looks like a emerald crab but is black. He hides mostly but keeps knocking off some of the corals-a torch directly on top of an elephant ear, not a pretty moment...

I hope someone knows something about him...?
 

johnny&sin

Member
Looks like a black emerald crab. I've seen them at my LFS before. Does he/she have sharp claws or the ones that resemble little suction cups on the tips? If it has the cups then it should be ok
 
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