API Furan-2 Fresh and Saltwater Powder Medication 850 gAPI Furan 2 Fresh and Saltwater Powder Medication contains two furan compounds to combat a wide variety of gram positive & gram negative bacterial diseases, including gill disease, mouth fungus, furunculosis (aeromonas), black molly disease (columnaris), fin & tail rot and dropsy. Ingredients Nitrofurazone Use Instructions For each 10 gallons of water, empty one packet directly into aquarium. Repeat dose after 24 hours. Wait another 24 hours then