Interpet Anti hair Algae 125ml destroys hair algae in aquariums. Hair Algae is an unsightly nuisance in the aquarium. It will grow on any surface and quickly prevents plants from flourishing. Hair Algae will thrive in any aquarium that has excess light and nutrients. Hair Algae comes in many colours including green, black and brown. Anti Hair Algae helps to control hair algae, helping to return your aquarium to its former glory. Use Anti Hair Algae when brown, green or black hair, or grass-like algae appear on plants and other aquarium surfaces.A treatment of 4 doses added directly into the aquarium. Treats 1125 litres. HARMLESS TO FILTERS & ALL SPECIES OF FISH AND PLANTS For use in Cold-water & Tropical Freshwater Systems.