Tetra Algumin is a mild biological treatment for combating algae in aquariums. When there is an increase in the build up of algae in your tank it can become unsightly and can clog up your aquarium and its equipment, producing an unhealthy environment for the fish. Tetra Aquarium Algumin contains natural peat extracts as well as the algicide Monolinuron, which is extremely effective in the prevention and control of algae. When the treatment is added to the water, it slowly turns the water a darker colour, thus inhibiting the natural growth of algae. This 100ml bottle treats up to 200 litres of aquarium water.