Any ideas on this crab

[Bonessurf]

I was at the lfs and the guy just happened to flip a rock and this guy was there. Neither of us had and idea what it was and he offered it to me for 5 bucks. Any idea on what it is?

 

[Purevil21]

Can't tell, interesting though.

 

[joy13]

I don't think I see it on this list Crab Hitch Hikers If you have a reef tank don't put it in until you know what kind it is they can be nearly impossible to get out.

 

[hiltymj]

It was probably just a crab that was really really small and was attached to something that the store had bought and he grew for a little while and then you guys found him. Ive seen it happen at my lfs. Probably just a sand crab

 

[Bonessurf]

Yeah, I've only scored a bunch of free polyps off some liverock I bought. We'll see how he works out with them since they are the only corals I have. My sailfin was picking on him for the first minute, but he seems pretty chill since then.