I’ve noticed that my green terror cichlid has had his mouth open for awhile and hasn’t been able to close it. Occasionally it has been breathing slightly heavy but not all the time. It also sits on its nest outside of the pot all day and won’t move unless it’s provoked or if it’s feeding time. It also has been eating well but has been eating very slowly. Any ideas what the problem may be? Cotton wool or mouth rot has crossed my mind but I’m not sure.