Crab ID ??

[BASEDREEFER]

Hey guys can anyone help identify this crab?
I was told it was a decorative crab but I’m not sure also told it was reef safe but caught him picking at my acan. Thanks

 

[BASEDREEFER]

Here another picture

 

[vetteguy53081]

Looks like an acro crab. They hang within acro , not destroy it but needs a colony or similar to hide in