use CFLs and computer fans. should be fine. not sure how much you'll get when you harvest but its worth a shot to try it bro. let me know how it turns out bro. post a few pics
the link just took me to the amazon home page. but iv never used any bottled CO2. just go talk to your plants. i know it sounds crazy but they love it. if you dont believe me talk to all of them except one and see what happens. happy growing bro. :weed:
just keep em inside if your worried about bein stealthy. if you cant keep em inside just put em somewhere they will get plenty of light and put clear plastic over them. you dont have to build an actual greenhouse just something to help hold humidity and heat