Shrimp id please

[rioshilo]

Found this in my live rock bin. Any idea what it is? It's about a 1/2" long, maybe a little longer. It only has one claw, dont know if the other one fell off or if it's just not visible, like maybe a pistol

Also found this crab in there...

 

[LeslieH]

You're right about the shrimp being a pistol missing the large claw. It's one of the rock-dwelling species & shouldn't get much bigger than it is now.

The crab is an Actaeodes tomentosus. In nature they're fairly benign, feeding mostly on algae & smaller inverts like worms. If you intend to keep it make sure it gets enough to eat by spot feeding it chunks of meat so it doesn't get hungry enough to go after other things.