Red Cyano Rx:Benefits: Red Cyano Rx will quickly and effectively treat Cyano Bacteria in your aquarium without harming any of its inhabitants when used as directed. Unlike some other products, Red Cyano Rx will not discolor your aquarium's water. Red Cyano Rx is safe for all types of Saltwater Aquariums and will not harm any of your fish, corals or other reef invertebrates when used as directed. This package will treat 400 gallons (1514 liters).