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Hi, I have had some plants in 10 gal tank for months know. Always battling the little bit of hair algae on them. I have been using excell and ferts. I just started using a disposable cartridge co2 system. I have read that co2 would really help plants and the algae go away. They are slow growing anubias and moss. The questions I have are should I turn down or shut off air stone when injecting co2 ? And where should the co2 indicator be - at the bottom or top of tank ? Thanks for any help.