About 2 months ago I had my fish quarantined for internal parasites which have since been cured. While moving the fish around it jumped out of my hand and hit the radiator somehow damaging both sides of its tail. Since then it hasn't healed and has turned black. I thought this was maybe an ammonia burn because the quarantine tank had no beneficial bacteria but idk it seems to very slowly be getting worse (maybe hard to tell). Yesterday I put in some melafix but I really don't know what this is. Any help is appreciated thanks.
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