Ok so not so good news. My female clown is like hovering above the sandbed and rapidly breathing. I have had her for almost 5 months and never had a problem. She eats like a champ and is the boss of the tank but today she's not doing good at all. I put a light up to the tank and it seems as if something yellowish is coming from her gills. I have a video but you can't see the yellow stuff because of blue lights. But you can see her rapidly breathing and yawning big. Any thoughts?. All other fish and coral are happy. Salinity is 1.026 nitrates is around 10-15ppm. Ammonia 0ppm. Nitrites 0ppm. Temp is 78. It's a 20L. I have 2 clowns and RG a firefish and a six line wrasse. No aggression what so ever between fish. As I stated she was the boss of the tank she would put the wrasse in place and always let the male clown know who was boss.