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The CO2 charts and the equation that goes with them doesn't take buffers into account, so the CO2 charts somewhat overestimate the Co2 levels. I base my CO2 levels off of the fully gassed pH before the CO2 and lights come on, and then I will take the pH after the CO2 has been going for a few hours. With this method shooting for a 1.0 pH drop is ~30 ppm of CO2. This isn't a permanent visual of the CO2 levels, but it gives a better idea of the levels.
 
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