Crab Hitchhiker ID please!

[reefhusker]

Can someone identify this crab I have been chasing for a month now? Unfortunately he has buddies that are still in the tank!

 

[1Reefer]

Could be...... many different crabs.

Place it in a clear glass or tupperware and take some close up pics, try to get the claws in one also.

From that pic I would go with the basic... "its a rock crab" but hard to tell from that pic.

 

[conide]

it looks like a commensal coral crab, is it on corals? do they travel around the tank? can you provide any more info on the behavior of the crab.