Hi hinoone66,
CO2 is not a necessity for all plant types, but if I wanted to grow certain plant types that required higher light levels then CO2 became a necessity. I started with DIY CO2 (sugar and yeast) but after several months I went with the tank and regulator.
Injected C02 is not needed if you keep the wattage low (1.5-2wpg), however the plants will benifit from the addition of a carbon source such as Seachem Excel.
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