Controls green algae and red slime in saltwater and brown algae in marine aquariums with fish, live coral and invertebrates. Helps reduce aquarium maintenance in marine and reef aquariums. Will not harm marine fish, corals or other invertebrates. When used in salt water it will not harm snails, clams, scallops, shrimp, anemones, sea cucumbers, feathers dusters, coralline algae, soft and hard corals and other invertebrates. Helps keep water clean and clear and does not discolor water or cause foaming. Help treat and control algae growth, and reduce your marine or reef aquarium maintenance with API's Algaefix. It effectively controls saltwater algae including green algae, red slime and brown algae in marine aquariums with fish, invertebrates and live coral. It will not harm marine fish, corals or other invertebrates. When use in saltwater it is also safe for clams, scallops, snails, anemones, shrimp, sea cucumbers, feather dusters, coralline algae, soft and hard corals and other invertebrates. Best of all, it's formulated so it won't cause water discoloration or foaming. Simply use Algaefix weekly to help keep your indoor aquarium clean and clear and in tip-top shape.