API Marine Melafix fish remedy is a safe, natural fish remedy which should be used to treat bacterial infections in saltwater fish and corals. Marine Melafix fish remedy contains Melaleuca (tea tree) extract to soothe and calm your fish, and rapidly repairs various fish ailments, from open sores to pop eye. It also reverses coral degradation. API Marine Melafix fish remedy will not harm the biological filter in your aquarium and may be used in all marine and reef aquariums. Add 5 ml. for each 10 gallons of aquarium water.