Well as a dutiful rookie in this hobby I went and read the FAQ and it said at night Co2 levels climb..guessing cuz all the trees and stuff working in reverse. For an indoor grow why couldnt a person just run the lights at night and draw in some outside air..making it possible to skip the artificial Co2 injection or so it would seem to me. I mean if it need man made Co2 so bad how can it grow wild outside along the river bank without nobody there to inject it? Color me cornfused.

bigwheel