I have tiger pistol shrimp for sale $10, the one draw back is that they will move a faair amount of sand in your tank as they settle down, the one plus it is interesting how they react to a goby.
I have a pair of tiger pistol shrimps that live with my yellow watchman goby. I wouldn't do it again. Moves too much sand and steals frags on the sandbed.
I have a Japanese Pistol Shrimp. I love him!! I have had him pull frags into his den before I made a tray. Other then that I have not had any sand flying around that I have seen*could happen when I am at work* My clown *from what I have seen* kicks up more sand then anyone else in my tank. So I say get one!!