Cyano X can effectively fight cyanobacteria. This version is optimized for sea water. Not being an antibiotic it does not adversely affect the biology of the aquarium. The product does not dispense from a regular maintenance of the aquarium but it is a remedy that in most cases resolves the problems of cyanobacteria during an acute infestation. If the cyanobacteria reform over time it is advisable to review the layout of the aquarium and to identify any previous problems.