So I have had a red fire fish for about 6 month and he use to swim around the tank all day long. I added a yellow watchman goby who made his home on the other side of the tank last month and life continued. I then came back from vacation and now the yellow watchman goby moved in with the fire fish in the same hole. I see them in there together but the fire fish dose not like to come out as much every couple days if I'm lucky. Is it possible they are actually pairing together of some sort or the yellow watchman is trapping him in there?