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How important is it to have co2 when starting plants? Is this something that I need to get Friday before I get the plants. I haven't done much reading on co2 but have read it can harm fish. I won't be adding fish for some length of time due to my tank not being cycled yet but do plan on adding fish. I'm looking into buying Anubias Nana, Water Sprite, and some vallisneria. I will be researching co2 but unsure if I definitively need it or not. Of coarse I want my plants to grow quickly which I understand this helps it to but dont want to harm fish in the future. Any help is appreciated!