Hi. I had my pistol shrimp first. He started digging right away. I added a watchman goby a month later and they paired up that day and are now best buds. You still won't see your goby a whole lot more as well as your pistol shrimp. They are somewhat a seclusive couple. But they are still cool to watch when you do see them. I like them so much I bought another pistol, a different type ( mostly red and dosn't dig very much ) and a orange spot goby and for some reason they have not paired up yet. Both gobbies and pistols are happy and I have never seen any bad blood between the different types.
HTH
