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. It will ensure that the most important nutrient is available to plants to maintain vigorous, lush and vibrant growth and condition. The Fluval Pressurized CO2 88 Kit comes with a 88-gram cartridge and is ideal for 57 to 151 litre (15 to 40 gal) planted aquariums.