Tiny -I pinched the tops 2 weeks into veg. I than put them under 12hrs of light.Loc Nar I am talking 3 weeks into flowering. I still cannot see anything yet. As far as the CO2 I am just giving it a small amount since my grow is in a 2X4 room/closet. I do have air coming in for 1minute every 10 minutes. Should I hold off on the CO2 until the 5th week of flowering?