White crab??

[tampashane]

So I spotted 3 of these little white crabs on one of my corals. The only color on them seems to be the very front of their face. They are very small maby 1/2 inch. Anyone have any suggestions on what kind they are or if they are bad for my corals??

 

[tampashane]

So apparently these little guys are acro crabs which is fitting as I found them in my Acros lol. Glad to see its safe!

 

[saxman]

Commensal Acro crabs (I forget the binomial name). Some peeps don't like them as they can reportedly bother their coral host, but I've actually seen them protect their coral from picking fish (found one once when we were weaning our OSFF off of live Acropora...took both us and the fish by surprise).