Check if he has flukes in his eyes. You could put him in quarantine and use Paraguard to cure his eyes if he has flukes. Mine had eye flukes when I got it and a huge pop eye, and after treating with Paraguar for 3 weeks the popeye healed and the flukes were gone.
He still does not have 100% vision I can guess but he see well enough to catch very small food in the water like fish roe.
It is worth a try.
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More fish die from human stupidity than any other disease...
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