The Planted Tank Forum - View Single Post - Do you run CO2 all day or partially?
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post #2 of (permalink) Old 02-10-2013, 03:50 AM
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From my readings on this website I personally won't be running mine all the time. Start 30 mins before lights go on, and turn off 15 mins before lights go off.

The plants will not be using CO2 when the lights are off. Not sure what type of pH swing you can expect, but if you run CO2 during the night I think you run the chance of gassing your fish because the plants are not using it for photosynthesis.
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