when does your co2 kicks in with respect to light? - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 09-30-2014, 11:26 AM Thread Starter
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when does your co2 kicks in with respect to light?

i've seen different numbers on this and currently experimenting myself, so if you have co2 on timer, please post your schelude of light/co2 times. thanks
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post #2 of 11 (permalink) Old 09-30-2014, 03:31 PM
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hour before / turns off an hour before lights go off

I don't think this is an exact science - just makes sure that there is ample CO2 when the photoperiod starts


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post #3 of 11 (permalink) Old 09-30-2014, 03:39 PM
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I generally run like klibs suggested. Unfortunately one of my timers is down so my Co2 is turning on exactly when the lights come on. It isn't the end of the world, but I'd prefer it the other way.
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post #4 of 11 (permalink) Old 09-30-2014, 03:40 PM
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Exactly. I have limited space for to manny timers so i split my two lights on separate timers one with the co2 solenoid comes on in the morning together and hr before the the next set of lights and i shut off the co2 and one set of lights and hr and a half before the next light ending at 930 pm
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post #5 of 11 (permalink) Old 09-30-2014, 04:57 PM
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3.5 hours before. The reason is due to ambient light which, while not strong, is strong enough to cause BBA on the rocks due to low CO2.
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post #6 of 11 (permalink) Old 09-30-2014, 05:24 PM
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CO2 on at 12:00pm -> set to drop PH from 8.0 and hold it at 6.8. Usually takes 2 hours.
Lights on at 2pm with a 1 hour sunrise
CO2 off at 9pm
Lights to a 1 hour sunset at 9pm
Lights off at 10pm.

Since I am controlling CO2 with PH, it is definitely a balance. I set the reg to 16psi and fine tune with the needle valve to try and keep it around 2 hours to drop it. That seems to give me the best performance with on/off cycle time of the CO2 throughout the photoperiod.
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post #7 of 11 (permalink) Old 09-30-2014, 07:08 PM
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I run mine a hour before lights then off a hour before they turn off. Well I did before my co2 timer failed and didn't shut off. Now I'm back to running lights and co2 on the same timer. So make sure you use a good timer and maybe stay away from the intermatic one I had.
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post #8 of 11 (permalink) Old 10-01-2014, 01:18 AM
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hour before lights on and off.

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post #9 of 11 (permalink) Old 10-01-2014, 03:16 AM
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2 hours before since my tank is big (120 gallons)

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post #10 of 11 (permalink) Old 10-09-2014, 03:38 AM
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I have come to the same conclusion as Solcielo, I turn on the co2 when ambient light starts, for me that changes quite a bit seasonally.
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post #11 of 11 (permalink) Old 10-09-2014, 04:59 AM
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1 1/2 hours. I placed a PH meter and actually waited for the PH to drop close to 6.0. It took the system almost exactly 1 1/2 hours to drop from a 7 to 6.0 @ 1 dkH.


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