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Keep your aquarium plants happy and healthy with fish CO2 systems from petco.com. Planted tanks are not only beautiful for aquascaping but essential for keeping some species of fish in their best condition. Aquarium plants are many and varied, yet they all need CO2 (carbon dioxide) to grow successfully.
In nature, aquatic plants can absorb CO2 from nutrient-rich soil as well as air constantly being dissolved in moving water. In aquariums, however, a regular supply of CO2 must be supplemented by aquarists. Aquarium CO2 supplies are important tools for keeping plants healthy and growing strong.
Fish CO2 systems provide dissolved carbon dioxide that aquarium plants need for photosynthesis. This process' name literally means "using light to make energy". In aquarium plants, CO2 is taken in with water and light and used to produce sugar (energy for the plant) and oxygen (the waste byproduct for the whole process). Of course, oxygen isn't wasteful; in fact, it's essential for healthy fish which draw oxygen from the water.