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How to measure CO2 in a large planted tank

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Hey I've been trying to find a reliable way to measure my CO2 level in my 190 gal planted/dirt tank. I have an external reactor and the trying to figure out to best bbm for it. I know there's a lot of variables in determining CO2 because plants constantly absorb it but there has to be a way to measure it besides pH drop or growth rates or bbm? Or I am just searching for a solution to a problem I don't have? 

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