Most people do it because at night, instead of releasing CO2, plants absorb it O2, which can lead to a deficiency in the water, and poison the fish.
if you have enough O2 for the fish, do not run the air. You run the air if the CO2 concentration is too high for the ish and they get stressed. It does nothing for plant growth. If the fish are ok, then take it out altogether~I've got a 20g setup running a CO2 tank/reactor. My question is: Do I need an air stone at night for proper plant growth? I have enough O2 without it for the fish but just want to make sure I get the optimum parameters for the plants. I've read that people do it but has anyone actually witnessed an improvement?
Thanks >> bW
That’s a big difference, I Think this is to much for the fishies.with no CO2 my PH is 8.2 with 6.7
I'll second that.From everything I have heard pH swings due to CO2 do not have an affect on fish. I run high CO2 during the day and aireate at night and have never had a problem with the pH swings.