Yeast and Sugar Co2

yeah its small, but its only going to a very small space... we'll see what happens

Wow, I just gotta follow up on this. After I added this thing my plants almost doubled in size in the first week, and I've seen a huge improvement in overall health, they all just seem much brighter...

the good thing about co2 it means your plants can grow at higher temperatures which comes in handy for closet growing also helps boost the immune system of the plant