Picked up a red Oscar at lfs a couple weeks ago. Picked the one with the best shape and color although it had a slightly ragged pectoral fin which o attributed to scrapping. However the tail fins became ragged later and pec never healed. Treated with melafix cleared up tail then came back cleared and came back etc. The pec has never shown improvement. Done messing with this want this guy healthy what's the best med for this?