Treat and control algae growth and reduce your freshwater aquarium maintenance with API Algaefix Algae Control in Aquariums. This revolutionary product is specially developed to control many types of algae including green water algae blooms and string or hair algae and will not harm fish or plants. To treat algae, add 1 ml for every 10 gallons of water and repeat for three days until algae is controlled. Use weekly to keep aquariums clean and clear. Do not use with freshwater crustaceans including shrimp, crabs and lobsters. For indoor aquarium use only.