Hey every one designing a new room it is going to be a sealed room with a/c and all. My question is about co2 for the veg it has got to be neccessery becasue there is no outside air at all but do you run it at 1500ppm or less?
1500-1800 is about the maximum you want to run. Average ppm in the atmosphere is 300. It's even less than that if you're over a mile high like we are in CO. Even bumping it to 600ppm will benefit your girls; I'd recommend starting out around 800-1000 and playing with it from there.