Dave, what I do, I combine CO2 with one of the light banks. Say you have half the lights on for 1 hour, then all lights for 9 hours, and then the other half for 1 hour. You could run the CO2 with the first half of the lights. That way the level will be good when the second half comes on, and turn off and slowly taper out during the last hour.
Just an example of course. Everyone does that a bit differently.
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