So my girlfriend and I adopted this old goldfish (could be anywhere from 2-4) we assumed he had ich because it looked to be it so we treated him extensively.. he was in terrible shape. He was in a 10g. Approx 4 1/2” it was half full and as dirty as a mud puddle, it was a sin, she wanted 40 dollars I gave her 20 and him a better home.. but the sickness has taken over again. Now on the opposite side. His whole Gill is now white, he’s loosing pigmentations in some scales, starting to worry, should I pull him out and treat the whole system and treat him again in a bread er tank or something ??? Photos will be linked for more visuals to try to understand