I will be using co2 in a closet type space with atleast 10 plants and wanted to see if the less expensive options are worth it. I have seen co2 boost and another product that comes in a bucket and you submerge some kind of "puck" in water to make co2. It say it will raise co2 levels to 1600 ppm. But if a co2 tank system is the only way to go, I want to do this right.