Reef-safe aquarium algaecide. Controls many types of algae in marine and reef aquariums. Will not harm fish, corals and other invertebrates. Will not harm coralline algae. Effectively controls Green algae, Red Slime, and Brown algae in marine aquariums containing live corals, invertebrates and fish. Use weekly to control algae growth and reduce aquarium maintenance. Does not discolour water or cause foaming.