I added a diamond sleeper goby as it was one of the fish I wanted since before I got my tank. After adding to my DT it immediately started sifting and eating. I found it hanging out near where my pistol shrimp and watchman have set up shop then an hour later he was gone and there was sand moved under the same rock my pistol and watchman are under. This was at least a month ago. My pistol and watchman just made their monthly appearance but I have yet to see my diamond goby. Would it be possible that he’s in their burrow with them or is he most likely no longer alive. I’m torn because I really want a diamond goby, but I don’t want to add another and then the first appears.