I have 2 discus and about 3 angels in a 55 gallon with 2 clown loaches 2 drawf gouramis and some x-ray tetras. Well the question is the one of the discus started out as a clear transperent film and then it began to seem to look like their were white patches over its whole eye it looks almost like a nipple cause its at the very center. I treated it with Maracyn for about 12 days and the discus died. The rest of the fish in the tank have the same symptoms and now my other discus died this morning with the same symptoms. I have no idea what to do can someone help me ?