Hey dude i just read/watched your post on homemade co2 gen. I have a few questions if you dont mind. Do you use is in just flower or veg or both? As i understand co2 is heavier than oxygen, does that mean you have the setup higher than the plants so it falls on them? I heard him mention that in the following vid he hooks it to a fan, do you have the link tfor that? How long does 1, 2liter bottle last? Thanks a ton!