It was implied you wouldn't use the exhaust fan in conjuction with co2 bags. I'd stick with what you've got going on for a few more grows yet. I was doing a million things at once and it got confusing to determine what the small changes were effecting because there were changes all around. I go with the The slow and steady as often as possible. Get your 2nd grow out of the way before you start adding a piss ton of variablesSeems counter productive for me if I have an exhaust fan 24/7