hitchiker crab ID

[TL1000RSquid]

Looks kinda like a fiddler but different smaller claws. Reef Safe? Is it even fully aquatic?

 

[TL1000RSquid]

He seems to be burrowing into the sandbed under a rock now, this may end badly for him my pistol shrimp lives near by.

 

[KellyFrancis]

He's cool-lookin, whatever he is! opcorn:

 

[greech]

I'm not thinking he is reef safe but its tough to say without a closer pic. I would catch him and throw him in the sump (or somewhere) until you get a positive ID.