API 176B Pond Melafix Fish Bacterial Infection Remedy, 16 Oz, Treats 4800 GalAPI Pond Melafix acts as an all natural, antibacterial remedy for koi and goldfish diseases, including eye cloud, mouth fungus, fin & tail rot, damaged fins, ulcers, and open wounds. Use if you notice these symptoms among fish in your pond, or when adding new fish. Pond Melafix is safe for snails and other invertebrates, and will not harm aquatic plants, affect pH, or adversely affect your pond's natural biological filter. Size: 16 ounce Pond Fish