I've had my goldfish for over 2 years and it has never once gotten sick or hurt. Today I was looking at it and I noticed that it's dorsal fin was drooping. Upon a closer look, I noticed there was some sort of white gunk on it. The white stuff almost looks like a fuzzy fungus. This is my first fish ever and I have no idea what that funk could be or how to treat it. Please help! I attached pictures so you can get and idea of what it looks like. One of the scales is also discolored.
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