i have a pistol and a cleaner in the same tank.. smaller tank. The pistol doesnt ever bother anything.. i keep him well fed. Whenever ive added something new to the tank he seems to come out to see what it is, but he hasnt ever eaten anything except once. Im pretty sure he got one of my sally light foots, since i got two and i have only seen the same one in weeks. Otherwise hes pretty interesting.. i think he can smell when i feed. Whenever i put in some blood worms for my puffer he immediately sticks his head out of the exact same place. So i go ahead and give him a piece of krill which he greedily snatches and runs back under the rocks with. Hes really cool i just wish he would stay out more often like the cleaner shrimp do.