I have read about everything on ventilating when using CO2. Nobody seems to agree on what to do. I have the CO2 running in my tent and I have the exhaust fan coming on every two hours for 15 minutes dark and light. Temperature and humidity are not problems in New England right now so I don't need to run the fan to control those. Some say twice an hour ventilation is right but then you exhaust all your CO2. What do I do to get it right.