You will need to check your pH and kH parameters. Using pH vs kH chart, you can determine the value of your CO2 in the water column. The unit of measure for CO2 in this case is in PPM. Preferably 20 - 30 ppm of CO2 during photosynthesis is preferred. Also, get a lily pipe to agitate the water surface, as O2 value during this period of time is important.
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