Hairy crab

[Reef Fever]

I have seen a crab that looks like a fat little tarantula in one of my new pieces of rock. He is dark gray or black and about 1.5" across. He looks like an Emerald crab with long black fur. My first impulse is to kill him or stick him in the overflow box.

 

[Anonymous]

Mythrax crabs have fuzzy legs, maybe that's what you have. They are supposed to eat valonia (mine doesn't).

Otherwise I would also be inclined to remove him, as beneficial crabs are in the minority and unknown ones have been known to do Bad Things.

 

[Ike]

I had two of the crabs you describe in my tank that had hitch hiked in on some liverock. BAD crabs!!!! Remove them