Acro crab.. good or bad?

Just saw a little crab on one of my acro' corals. No bigger than an eraser head on a pencil. Is this little guy ok or do I need to get him out of there?

Thanks,
 
If its smooth... or has a bandit look eye pattern.. like a stripe, its good.

If its hairy, squat, with red or blue eyes, its a coral eater.
 
Thanks,

I'll try to get a good look at him during feeding time. I don't think I can get a pic without an underwater case but we'll see.
 
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