The only epa-registered reef-safe algaecide. Controls many types of algae in marine & reef aquariums. Will not harm marine fish corals or other invertebrates. Keeps marine aquariums clean & clear. Add 1 ml for each 10 us gal or 5 ml for each 50 us gal repeat dose every 3 days until algae is controlled. Once algal growth is under control add one dose per week
