timing light and CO2 - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 01-22-2014, 10:45 PM Thread Starter
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timing light and CO2

Hi all, branching off another thread, had a question about timers and CO2/lighting. I just got into compressed CO2 and run it on a timer, onto which I had my light attached as well (i.e., both light and CO2 start and stop at the same time). I noticed in another thread people have their CO2 start 1-2 hours prior to the light coming on, and stopping about an hour prior to the light ending. Is that the standard practice? I will hook up an extra timer. Thanks!
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post #2 of 4 (permalink) Old 01-22-2014, 11:27 PM
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The practice that you have described is quite common; this method allows CO2 to be at optimal concentrations when the lights come on and plants start photosynthesis.

Conversely, having the CO2 shut off an hour or so before the lights turn off also allows the CO2 concentration to taper off before the lights shut off and plants stop photosynthesis.

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post #3 of 4 (permalink) Old 01-22-2014, 11:34 PM
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Starting your co2 before your lights are on is pretty standard. The idea is to have your co2 level already up close to 30 ppm before your lights are on. That way everything is already stable. This will help with algae issues. It my case it takes 3-4 hours for my drop checker to see the co2 change , so I actually start my co2 about 3 hours before my lights turn on. That way I can see what level my co2 is before my lights actually turn on. This is how I do it anyways. Others might have a little different setup.
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post #4 of 4 (permalink) Old 01-24-2014, 11:40 AM Thread Starter
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Thanks guys, just added a new timer. One quick question though, is the amount of CO2 plants produce during respiration when the lights are off a fairly minimal amount compared to the amount I'm adding with the injected CO2? I had assumed there would be a certain amount of CO2 in there most of the time even with the lights off due to that process (I'm still a newbie with planted tanks). Appreciate the help!
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