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I've recently purchased a small co2 kit that I've been using for the past 3 days. I'd appreciate some your response regarding the observations I'll describe here: I've noticed that very rapidly does co2 change the pH of water. After about 5 minutes of running the co2 diffuser in my 20 gallon planted farm tank has seen the pH go from ~7.8 to now ~6.8. This leads me to believe that co2 simply ionizes the hydrogen particles to a controllable degree in the water very immediately after it begins running. About an hour after shutting down the co2 system then does the pH begin it's rapid ascent back to 7.8 What level of pH swing due to co2 injection is reasonable to expect more plant growth? At what point is it dangerous to the life inside of the aquarium? Am I on the right track here? cheers!