iodine application to oscar wounds
I had a 4-H (Marine Biology) leader that had many massive (80 gallon and up) aquariums with large cichlids, mostly oscars and jack dempseys.
When her fishes got banged up she would prepare a wet towel and carefully take the injured fish out and lie him on the towel, then dab the wounds with iodine. The fishes were actually very good about it and didn't flop about much at all. I don't know if they were conditioned for that or just happened to be extraordinarily well-mannered, but the wounds healed nicely.
Anyone else ever do that?