Ensure a healthy and clean living environment for your pet fish with the help of Tetra Broad Spectrum Aquarium Algae Control. This product is specially formulated to combat green water. The 1.69 fl oz Tetra algae control works against different varieties of algae that commonly grow on glass and decor. One bottle can clean up to 600 gallons of water. Eliminate aquarium algae and keep it from returning with Tetra AlgaeControl Freshwater Aquarium Algaecide. Algae is common problem, but if left untreated it can cover glass, filters, plants, d??cor and substrate. Made with poly ethylene, Tetra AlgaeControl Freshwater Aquarium Algaecide is highly effective against green water, bluegreen algae, diatoms or brown algae, hair algae or blanket weed. It is safe for use in planted aquariums and comes with a precision dropper to ensure proper doses are administered.