Is there blackening and/or redening on or around the fins?
Is there anything in the tank he could have torn his fins on?
IME, you don't need meds right now, meds will increase his stress level. Keep the water clean and his fins should heal right up. Do daily 25-50% water changes until you see his fins healing up. Then go back to a regular weekly 50% water change schedule. If it looks to be getting worse then consider meds.