Two of my fish have been sick for a the past year, I have tried many medicines but none of them. Though this subreddit might have some suggestions so here are some pics of the fish. I have been changing water frequently, any suggestions on how to fix this? The tank is a 65 gallon tank, haven't added any fish or decorations for the past year. All fish are older than a year, the oldest one is 9 years old and the youngest is 3 years old. The fish in the first picture is 4 years old (10 inches length) and the one in the second picture is around 3 years old (average size).