Read about furunculosis. I would go to the kanamycin if this is a chronic issue. Continue with the furan and MB and add the kana to them as well to hopefully give it the knockout punch.
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Yes I wish I would have added the Kana from the start instead of 5 days in. Maybe I will put the fish in a hospital tank for 7-10 days. I've read up up Furuncluosis but for some reason dismissed that. Can't remember why. Will check. Thanks again.