I have a veg and flower tent in my room. I've sealed off the ac vent and am using a dual hose ac unit connected to the window. Therefore, The only air going in and out of the room is the room door when I come in and out. So, I'd considered that a 90% sealed room? My fan filter is not in the tents, it is sitting outside of the tents. Both tents have ducting connected the the fan filter near the top of tent sucking hot air out. There is a opened panel with mesh on the bottom of tents for air intake. I am adding a co2 tank/regulator set up inside the room. Does it matter where I place the tank since all the air in the room is being recirculated over and over again? Or should I find a tube and split it into 2 tubes somehow and run those tubes into the tents around the plants? If I don't need do this and can let the tank sit in the room somewhere in the corner... do I even need a tube?