i have my hood, blower, and ducting running clean through the top of my tent with no ventilation inside the tent, notice in the picture how the ducting and blower is cooling the light. my real question is, do i need to ventilate? i have c02 inside the tent with a fan on the ground blowing it all around the bottoms of the plants. so basically no outside air is circulating through my tent. this is correct, right?