This morning when I checked on my fish tank; my yellow tang was dead. Other fish had been picking at its eyes. I have a 58 gallon tank with numerous coral, 2 oscellaris; green chromis; baby blue tang that is about the size of my large oscellaris. My water parameters are fine. The tang had been eating fine. It seemed to be slower to get to the food than the other fish the last mth. The other fish were faster and it waited till the fishfood sunk so it had more room to get it. It had no spots on it. It almost seemed that the fish tank was too small for it and it could not swim like it wanted to. Could that be the reason? It was about 3.5 inches in diameter. I have had it since i started my tank over 3 years ago. I am sad