Help ID'ing a hitchiker crab

[insanity101]

Just wonder if any of you guys can identify this hitch hiker crab
I suspect he *may* have eaten a small clownfish, but can not be certain..
He moves very quickly and is on the small size.. caught him in a soft drink bottle trap

 

[Alysiak00]

id rip him out or put him in ur sump. looks like a sally because i had one eat a clownfish