02-09-2013, 02:27 PM
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I actually wouldn't prevent PH swings at all. CO2 is acidic and when you inject it pH drops noticeably 0.5 or more fairly often. I personally see no point at injecting air at night unless you are injecting pressurized CO2 24/7. Yet still I've read of ppl injecting it 24/7 without air just fine. Running air increases the CO2 gassing out of the tank and depending how you are running your CO2 it can increase or decrease a pH change. I use a solenoid which is an electronic on/off switch for my CO2, so I have never bothered with running any air. If you are using yeast CO2 I would say no air at all since its hard to even reach desired levels with yeast CO2.
So basically if you run pressurized 24/7 it can prevent a CO2 build up at night when plants are not consuming it and in-turn a pH drop. If you use a controlled pressurized system that turns itself on and off, running air can increase a pH rise by removing a large amount of the CO2 at night.