Rhinox 2000 - Glass Reactor for Aquarium Plants CO2 Diffuser Pollen Aquarium Ada Beetle You are winning a Rhinox 2000 CO2 diffuser! Improve the growth & health of your plants with sufficient Co2 supply! Atomic pores on the ceramic disc break down Carbon dioxide into tiny streams of bubbles Suitable for tanks between 20 to 40 US gallon. With the highest surface area per volume ratio, Co2 can easily dissolve