Anyway, I don't mean to suck the fun out of it. It's cool to play around with I suppose. As far as adding Co2 to your tent, I use the exhale 365 bags. 1 in a 2x4 and 2 in a 4x4. In addition to that I will sometimes use a "yeast bomb". That's just a mixture of yeast, water and sugar. You can DIY it with a bucket a lid and some tubing.
Recipe per gallon container is:
1/2 gallon warm water
4 cups sugar
1 oz bakers yeast.
Swirl bucket every other day. On the 7th day, add one cup of sugar. On the 14th day, dump it all and start again. Multiply the above recipe X whatever size bucket you use. If you use a 5 gallon bucket (for instance), multiply the above by 5.