Blue Life Green Cyano RxBlue Life Blue Vet Rx Green Cyano Rx quickly treats disease causing cyano bacteria in freshwater aquariums, without harming inhabitants or beneficial bacteria when used as directed. This treatment removes cyano bacteria from rock, plants, sand, and gravel without discoloring aquarium water. Quickly treats disease causing cyano bacteria Effective against bacterial growth on rock, plants, gravel & sand Will not discolor water or harm fish or beneficial