Crab ID

[JacobO]

Got this little hitchhiker on a rock from Liveaquaria.com. Could someone ID it for me?

 

[Sugar Magnolia]

More than likely it's a species of xanthid crab, which, more often than not, are predatory. If you can catch it, place it in the sump.

 

[ToadSprocket]

I would bust out the chopstick about now, but that's just me.