help identify crab

[barmstrong]

Hi,

I recentlly started my 180 g reef back up and purchased about 40lbs live florida rock to see the tank. after about three months going now, I have found about 4 or five of the crabs in the photo from small to nickle size. Any idea of the type of crab this might be?

 

[Maggie321]

Try attaching the photo again. It didn't go through

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