I thought about the CO2 being sucked away, but I put the bottles on the opposite side of the closet, so at least the CO2 has to be pulled through the plants to be sucked out, and CO2 is heavier than normal air, so it might stay lower or something. It was like 50 cents to do a CO2 bottle, so even if it does nothing, it was good practice. I do intend on drawing air for my air cooled reflector from outside the room on my next grow. I need to get in the attic and have a vent installed. I am getting my house resided in the summer, so I will wait for that until I start cutting holes in the siding and putting vents that lead to a grow area.
My plants are doing good. Today is the end of week one of flowering. I found two more males the other day, so that leave me with 6 females out of 11 total plants. I started some seeds for my next grow. I will be buying some real strains soon, which is when I will start cloning. I was all ready to clone, but I didn't want to clone bagseed.
Five weeks of vegging under a 400w MH and so far it has been one week of budding under a 600w HPS.
Hopefully they turn out good. I've been using half strength Fox Farm Tiger Bloom (1 TSP per gallon) and some molassis (1 TSP per gallon)
Below is a picture.