"ALGICID" is a preparation against excessive proliferation of algae in aquariums. Should there be excessive proliferation of algae in your aquarium, either the tank is illuminated too much or the water contains excessive quantity of nitrates, - your aquarium needs to be treated with Algacid. Dosage: 5ml per 25 liters of aquarium water. The intervention may be repeated after three days; then it is recommended to renew one third of the water. Algacid is toxic for snails.