Use this CO2 calculator to determine dissolved CO2 in your aquarium. The calculator can also be used to calculate recommended bubbles per second of CO2 into the aquarium and a ppm depending on planting level specified. In this case the pH and KH fields can be left blank.
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BPS calculations are different for each aquarium and depend on efficiency of diffusion and a number of other parameters. For this reason it it recommended to begin at the lower end of the recommendation, run tests and adjust co2 dosing from there.