Since all planted aquariums lack CO2, it is extremely important that they are supplemented with it. In fact, 40 to 50% of a plants dry weight is composed of carbon. For optimal condition of aquarium plants, some CO2 supplementation is necessary. Fluval Pressurized CO2 Kit is the ideal CO2 supplementation system. It will ensure that the most important nutrient is available to plants for maintaining vigorous health and lush and vibrant growth. To guarantee perfect conditions for aquarium plants, appropriate lighting and fertilizing is highly recommended.