Tetra Algae Control 3.38 Ounces, Broad Spectrum aquarium Algae Control (77184)Product Description Tetra Algae Control is formulated to remove unsightly algae fast from your aquarium This liquid formula effectively combats aquarium algae and also works to prevent it from returning This formula is highly effective against algal blooms that cause green water and works against algae that grow on glass and dcor such as blue green algae (oscillatoria) diatoms brown algae (synedra) hair algae (spirogyra) or blanketweed (oedogonium)