Niko, why do you assume that the plant release CO2?
They are always producing CO2, every aerobe does 24/7.
Compare this with the O2 levels.
You'll find a correlation.
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What's interesting to note is how fast the CO2 is being consumed (pH increasing fast when the lights are on) in comparison to the CO2 being accumulated (duing the period of darkness). Maybe someone will explain that difference, I can't:
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Sure, the plants remove the CO2 very fast, at night, the flux rate from the air into the the tank is much slower.
Regards,
Tom Barr