I recently established a shallow breeder tank for nano size fish hosting only carpet foreground plants, so I thought it was time to improve my DIY Co2 diffusion. I purchased a simple $10 cheap, small 14cm long ball reactor, then took the ball out since the top and bottom twist off, and I got a nice little vortex going off my XP3 outlet. the XP3's water outlet flow valve comes in handy by allowing me to set just the right pressure to keep a Vortex going without too many bubbles flying out the bottom. I prefer using the pipe outlet bottom instead of a foam ball as it helps keep the vortex spinning, and gives my fish some fast water flow along the glass they seem to enjoy. I like that there are no diffusion ceramics or foam inserts I need ever clean.
