API Melafix is a breakthrough antibacterial remedy that uses a derivative of the Melaleuca (Tea Tree) to treat bacterial infections in fresh and saltwater fish. Rapidly repairs damaged fins, heals open wounds and ulcers, stops mouth fungus, and treats fin and tail rot. Safe for reef aquariums and live plants. Causes rapid growth of new fins and tissue in as little as 4 days of treatment. Safe for scaleless fish, fry, and invertebrates. Will not affect pH, stain the water, or harm the biological filter.