co2 c02

First off the obligatory 'longtime lurker first time poster.' By the way, I love the site! I've built my room over the past couple month in stages(on a bit of a budget) in a spare bedroom of my house a 6'x8'(Vegging in the same room, just built a simple wall for my veg area) and I just put the...

I've got a 4.5 x4.5 tent inside a closed bedroom. Haven't seen much discussion about how to add Co2. Any advise on the various ways to add it would be appreciated. Thanks!