When to shut down co2 when using a reactor?

[Omegatron]

Hi, i am using an ista mix max reactor with my pressurised co2. Because my tank is in the living room with big windows i have a good amount of ambilight before lights go on. Therefore my co2 goes on 3 hours before light. Lights go out after 8 hours. My co2 is set to go off 2 hours before the lights do.

Recently i have changed checkvalves and now i notice that the co2 is a lot longer in my reactor (not sure if its because of the checkvalves). When the lights go out the reactor is still dissolving the co2.

My question. Should i set my timer so that 2 hours before lights go off the reactor has completely dissolved all co2? In my case this could mean that i can probably turn co2 off 3 / 3,5 hours before lights go off.

Thanks for the input.







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[EnderUK]

I set them two hours before lights on and off two hours before lights off. Why waste the co2 when the plants use the most at the beginning of the photo period.

 

[tim]

Agree with enderuk, mine comes on 3 hours before and off 2 hours before lights on my 3 footer, best to have it optimum for lights on and used up by the end of the photoperiod for the health of your livestock IMO, when I ran it to an hour before lights out my pencil fish would sit at the waterline for a good few hours after lights out, now they just go about their business normally.