Product Information AQUATIC VENTUREZ Algaecide It effectively removes and prevents algae growth such as hair algae, beard algae, brown algae, blue-green algae, black brush algae and harmless to aquatic plant and fishes if used according to the directions. It is important to note that during application, the aquarium must be supplied with enough oxygen. USAGE INSTRUCTIONS: 2 ml daily for 10 litres for 7 days. Change 50% water next day and repeat the dose. Note: Not to be used with invertebrates. Cap-full is 6 ml.