This API PIMAFIX Antifungal Freshwater and Saltwater Fish Remedy 237 ml Bottle rapidly and safely treats fungal infections on body and fins of fish. It contains all-natural extract from West Indian Bay Trees to help with fungus and cottony growth. It helps heal internal and external bacterial infections in freshwater, saltwater, and reef aquariums. Use daily for a week when treating infections. For a more broad-spectrum treatment, it is recommended to use API Melafix and Pimafix together. Maintaining good water quality is the best way to keep your aquarium clean, keeping your fish strong and vibrant, and preventing disease. Test your aquarium water weekly to verify good quality and perform bi-weekly partial water changes of no more than 25% to reduce toxic buildup and remove dead organic matter.