IMHO and from readings, CO2 should be run from 1 hour after lights on till lights off every day. the first hour has to do with the stomata opening and looking for more CO2. i got the CO2 BOOST system (google) $100 per grow but is VERY simple to use and NO oder at all. those should help though, more CO@ w/ adequate lighting will help as long as you use them enough.

db:smokin: