hello i have a sick tang in my QT (I put him here immediately, got him last week) that I think has velvet, I saw a lot of tiny white spots on him two days ago. I immediately started treatment with coppersafe and gradually raised it to 2.0ppm ~2.1ml/gallon, I have about 15.5 gallons of water in this tank. This morning I found him like this, it looks like his skin peeling off, is this brook? I also found a bunch of white stuff at the bottom of the tank, maybe dead skin?