Remove the fish to a QT. Perform a thorough tank cleaning, including vacuuming the substrate and water change. Add a dose of fungicide from your LFS. Remove the infected fish from the QT and place it on a soft towel soaked in saltwater. Cover the fish's eyes with a corner of the towel to reduce struggling. With a dry paper towel, carefully scrape the fungus from the fish. Wet a cotton swab with tincture of iodine and daub the infected area until covered. Let the solution sink in for a few seconds then return the fish to the tank.
A good tank maintenance program should keep the problem from reoccurring.Trouble Shooter Start