Flourish excel is supposed to allow you to do plants without CO2 because it supplies carbon. It is about $12 for a 500mL bottle and you are supposed to use a capful 5 mL every day or twice a day. Seachem has a lot of plant products that everyone says works, but the costs add up quick. I can see how getting the cylinder might be cheaper in long term. Personally, I love java fern and java moss and I use flourish excel for a couple weeks whenever I can't stand the algae anymore. It really does help with some types.
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