Well....my Red Cap Oranda is not doing as hunky-dory as I first thought. He seems cured of the HS but his Cap is 80% white now and he has a huge ulcer forming on one eye, the other looks pretty okay. Any ideas?

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55 gal. tank-3 Koi, 3 Shubunkin, Black Moor, 2 Goldfish, 1 Calico Telescope, 2 Sarassa Comets, 1 strange Fantail.