I have a DIY CO2 in the glosso tank.
It's at 4 WPG right now, and I'm probably going to up it to 6 WPG, depending on how the glosso keeps growing. It's showing good vertical growth right now. I'm going to have to keep cutting and 'train' it to grow horizontally. Hopefully that works.
If the HC doesn't work out in my 20... I may put the glosso in there, w/5 WPG and CO2 using the paintball cylinder I've got.