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Sound like ich to me. Maybe some of the more experienced freshwater people will chime in here. But if hes rubbing against things, and its white, then it sounds like ich.
I don't think it's ich, I know what ich looks like but this is like one huge white patch not little white dots on fins etc. I think it might be fungus , either that or pH or ammonia burn? Not sure cuz my water quality is really good, I change water daily
If it is fuzzy it is a bacterial infection or a fungus. Hopefully you have a hospital tank you can set up so you don't have to stress out the whole tank until you figure out what you are dealing with. Look up columnaris and see if that is what it looks like.