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So my lights are on from 10 am to 6 pm. The solenoid is turned on 1/2 hour before the lights go on and an 1/2 hr before they turn off. It takes about three hours for my drop checker to turn green and is staying green at least three hours after lights off. Would it be better for met to set my solenoid to turn on three ours earlier and then off three hours earlier? thanks
 

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Well it does take time for the CO2 to be absorbed and diffused through the water. Any CO2 added to the water is better than nothing.

Semi-healthy plants are better than gas-ing the fish.
 

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Take a pH reading of the tank water at lights out. That is the pH you want when lights go on.

If pH is higher at lights on then turn the solenoid on earlier.

You can do the same thing to determine when to turn the solenoid off, measure the pH every half hour after it goes off to see when the pH starts rising.

Remember this is a very rough measurement of CO2 content, what matters is how the plants and fish are doing.
 
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