crad identification

[marlin_dory]

i got a piece of live rock for my picotope and i checked today there was a hitchhicker i dont have a pic but it looks like an emerald but has red eyes black pincers and has a zebra like pattern

[kar93]

http://www.meerwasser-lexikon.de/images/1892.jpg

Like this?

Thats a mithrax

[marlin_dory]

almost but the arms are bigger and have the zebra like pattern as well

[marlin_dory]

and if thts what it is wat does it eat