I think CO2 is a waste of money for someone on their second run, there are so many other things you could dial in before you spend all that money on a CO2 system and buying tanks.
For weight.....
About a pound.[/QUOTE
well thats ur opinion but id have to disagree with you . I may be a new to this but my level of knowledge when it comes to growing isnt of the average , at all.. ive pretty much got everything dialed in . my humidity ,temp ,air flow and my feeding schedule. . my tent is also in a closet so im not losing co2 at all not to mention i have a co2 regulator that turns my co2 on and off without me having to do it manually. .. My very first grow i grew a pound and it was nothing compared to what i got going on now . Plants are much much more larger in height fullness .. not saying im a pro because im obviously not but i know ive done my homework and my last harvest was proof of that.