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Old 12-03-2012, 12:45 AM   #2
Darkblade48
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To accurately estimate the levels of CO2 within your aquarium, you have to use a reference solution whereby bicarbonates are the only thing contributing to kH. Most people choose to use a 4 dkH reference solution, along with the pH indicator (bromothymol blue) that you already mentioned, as the indicator will turn green when there is about 30 ppm of CO2 in the water.
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A Primer to Pressurized CO2 and A Primer to Planted Tanks
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