CYA-NO is a cyanobacteria inhibitor that inhibits and combats the most common forms of cyanobacteria. An environment is created that encourages the development of beneficial organisms that compete with the cyanobacteria. In addition, the conditions in which the cyanobacteria thrive are slowly changing. CYA-NO affects the aquarium system in a safe and natural way by affecting the N, I, P, K and B values and the NCP ratio. Most importantly, CYA-NO inhibits the growth of cyanobacteria without any form of antibiotics or harsh heavy metals. Therefore it can be safely used with any reef system.