Tetra Algumin is a dual action treatment for algae in the aquaria. Can be used in aquaria containing fish and plants and is effective against green, red and brown algae. Contains natural peat extracts and the algaecide monolinuron for the prevention and control of algae. The treatment works by darkening the water to inhibit algae growth and should be used both to treat algae issues and as a preventative. Instructions for use: - Shake well before use - Add 5ml of Tetra Algumin for every 10 litres of aquarium water. - Distribute the Algumin evenly over the surface of the tank and avoid placing the product directly onto any floating plants - Switch off any UV clarifier\'s for maximum effectiveness If necessary re-treat 3-4 weeks after with half the normal dose.