Black Moor goldfish with eye infection?

My black moor has a tissue-like white spot under its eye, (NOT Ich, there's none on the rest of his body and I do water treatments all the time) and it's starting to turn his pupils cloudy. I think he's going blind! I don't know what caused this, or how to treat it. Help! Is my fish going to die... show more My black moor has a tissue-like white spot under its eye, (NOT Ich, there's none on the rest of his body and I do water treatments all the time) and it's starting to turn his pupils cloudy. I think he's going blind! I don't know what caused this, or how to treat it. Help! Is my fish going to die eventually because of this? Will it affect my other goldfish?
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