So recently my clownfish has been fading in color but has been eating and behaving normally. But this morning he was hiding out in a corner with my starfish and he looks more pale than ever. In addition he is breathing rapidly, not accepting food, and his fins seem to be deteriorating. What disease could this be? Also if you are wondering my other fish is her boyfriend a black occelaris who is very healthy and happy also he has been watching over her ever since shes been sick. My parameter are as follows: PH 8.3, ammonia 0 ppm, nitrite 0 pmm, nitrate 20 ppm, alk 12 dkh, calcium 500-540. These are last I checked but I just did a water change a few minutes ago so the params should be better now.