Since all planted aquariums lack CO2, it is extremely important that they are supplemented with it. In fact, 40 to 50% of a plant's dry weight is composed of carbon. For optimal condition of aquarium plants, some CO2 supplementation is necessary. The Fluval Mini Pressurized CO2 Kit is the ideal CO2 supplementation system for the Fluval Flora and other planted aquariums that are up to 15 gallons. It ensures that the most important nutrients are available to live plants to maintain vigorous, lush and vibrant growth and condition. The Fluval Mini Pressurized CO2 Kit is easy to use and will ensure your plants stay healthy and strong. To guarantee perfect conditions for aquarium plants, appropriate lighting and fertilizing is highly recommended. The kit includes a regulator valve, cartridge bracket, disposable CO2 cartridge, hose, and an internal CO2 diffuser.