I have a nice little blue spot watchman goby that is paired up with a pistol shrimp in my tank. I would like to set up a small nano tank and just have a mated pair of watchman gobies and the pistol shrimp in the tank. Has anyone had any success getting them to pair up? Can I just go buy another small watchman goby and add it to the tank? Just curious. I don't want them to fight, but not sure if they are act like clowns or what the process would be.