Crab ID help please and thank you

[DreTheReefer]

Any idea what this guy is? He is the size of a pinky nail and I found him in a birdsnest colony. Looks purple and orange almost.
http://i1216.photobucket.com/albums/dd367/Dre3281/ddcd5e7c.jpg

[MikeandNicole]

That looks to me like an acro crab. Purple body and orange claws?
If I am right (and I think I am), that guy probably came into your tank on a pocilipora or acropora colony, an d,ingrates over to the birds nest. I love acro crabs.
He is reef safe, I would put him back into your tank and enjoy.

[dzhuo]

That looks to me like an acro crab.

Yes. This is a Trapezia digitalis and he's a good guy.

[correctamundo]

+1 good guy 'acro crab'.
Beneficial, put him back in. :D
I purposely buy them.