Almost three weeks ago I got a Male/Female pair of Firefish gobies. For the first week the male swam around the tank and the female sat in a cave that they both made. Around the second week they disappeared and rarely I would see them in the cave and I would normally just see one. Halfway through the second week and all the way through the third week I couldn't find them. Does anybody know what could have happened to them? One thing I think I should add is that two weeks before I got the Firefish, I got a cleaner goby and he is currently doing very well. Also I have a Bar Goby, Bluefin Damsel, the cleaner goby and the Firefish. My inverts are a serpent starfish and ten assorted hermit crabs that are not predatorial.