Read some where back that someone was using a hamster or two (that liked to run on a wheel) to boost CO2 in a grow closet. How much CO2 would a hamster produce vs the levels of CO2 utilized with a regulated CO2 set up. Would need to find a hamster that liked to run during the day, or put him on a different light schedule to be more effective. Would it be necessary to channel a rodents' out put or just have it in the same room.