This Tetra Algumin has been specially developed by the experts at Tetra to help prevent the formation of unwanted algae in your fish tank. An overabundance of algae in your tank can look dirty and clog your aquarium, creating an unhealthy environment. When used correctly, Tetra Algumin is completely harmless to all fish and plant life (except algae of course). If you spot algae growing in large quantities in your tank � treat your aquarium with Tetra Algumin immediately. Tetra Algumin is tried and tested � it is a fast and effective treatment for algae infestation. Can be used to combat all types of common aquarium algae.