My goldfish's eyes seem to be bulging out more than they used to, his poop is sometimes white and stringy, he's lost a few scales, and he lost all his color last year, save for his head, which is somewhat orange.
He's around 2-3 years old, still swimming around actively and eating normally, so I have no idea what's wrong.
If you know what could be wrong, please tell me how I can treat him.
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