Tiny crab ID on a coral?

[AceB9908]

I just got a Trumpet/Candycane frag and when I dipped it I saw this little guy sitting inside the tissue of the coral. I got him out pretty easily and got him in some clean saltwater until I figured out if he was good or bad. The only thing is I have absolutely no clue what kind of crab it is! It doesn't really look like any of the common ones you find. Any help greatly appreciated!

 

[ScottR]

Looks like a gall crab. @KJ may know for sure.

 

[AceB9908]

Looks like a gall crab. @KJ may know for sure.

That's what I was thinking too but I wasn't sure.

 

[KJ]

Looks like a gall crab.

Agree!

 

[Homelander]

Looks like a gall crab. @KJ may know for sure.