I'm looking for someone that has real experience with a grow tent (or small vented grow area) and Co2. If you are running a grow tent and a HID, then it is a necessity to run an exhaust fan. Regardless of how it is ducted in you are going to be pulling the air out of the tent quickly for cooling reason. Can you still run a Co2 tank system? or is it wasted as the tent is vented to quickly?