So you are exhausting air out of the tent then and it is in no way sealed. Making your added co2 pointless. You tent is pulling in fresh air and the co2 you your wife your kids your dog breath out, which is plenty for any hobby grow.
You talking to me? Im betting there is always someone in your house breathing. Even if there isnt, it takes a long time for all the air in your house to cycle through the tent and the plants dont just instantly absorb every bit of co2. If your tent has an exhaust fan, that means its pulling in air that people or animals have breathed at some point or another. Small indoor grows just do not need additional co2.
