I they are eating well, and not continuing to fight, best thing in my opinion is to leave them alone and they will heal on their own. If they won't stop fighting you may need to remove one of the fish to another tank, like a QT. In extreme cases a longterm bath in a broad spectrum antibiotic, like nitrofurazone, may help injured fish heal up faster.
Side note I would never put an antibiotic treatment in a display tank.