last night I finally saw another hitchhiker - a 3/4 pistol shrimp , I thought I had seen "something" before but always thought my eyes were playing tricks on me til last nite . About an hour after lights out I seen him zip across the front of the tank then I sat for 1/2 til I saw he come back around again - definitely a pistol shrimp - but would he be good or bad in a 10gal reef .