12-22-2008, 01:32 AM
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No, CO2 injection and air stones do quite different things. The main function of an air stone is to create turbulence and break the surface tension allowing gases to be exchanged between the water and the air above, such gases as oxygen, nitrogen, and CO2. CO2 injection provides additional bio available carbon in the water, CO2 is usually the limiting growth factor in aquarium plants. Though both air stones and CO2 injection are usually good, it would be completely counterproductive to use both at the same time. you can grow plants successfully without CO2, or so I have heard, but CO2 helps allot. If you have a small tank, I would encourage you to build your own CO2 generator, relatively simple but requires weekly maintenance. Otherwise pressurized systems are the only other way to go and they are quite expensive. If you dont use CO2 injection an air stone would be a good idea.