What kind of crab is this?

solid8447

New Member
My lfs had someone bring in a bunch of live rock that came from a 480 gallon in the wall tank. I bought some and brought it home and when I was setting it up an big shell fell out of the rock and it started moving. I have many little hermit crabs but this thing is way bigger. About 3 inches. I have no idea what kind it is and if it is dangerous to corals or not. I have a golden clam, sea mat, and xenia in there now along with a emerald crab, lightfoot crab and anemone crab. Should i keep it in my tank or move it to the QT tank
 
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