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I dont think you need and Medication, Fish's fin's will heal on its own. Unless there is poor water quality, or an aggressive fish that is a repeat nipper
It iis not uncommon to get them with fins that are a bit nipped. When I first got my school, many of them had bits of fin missing. After a couple weeks to a month they were just about all better.
Kool thanks everyone no repeat nippers I think it was like that when I got him but just noticed water quality is perfect I would brush my teeth with that water lol joke