Check the listing for details. Co2 Diffuser Aquarium Bubble Reactor System Atomizer Fish Tank Live Plants Water. Color: Small, Condition: New. Listed at 13.99 USD. CO2 Diffuser for Aquarium Bubble Reactor CO2 System Atomizer for Fish Tank Live Plants Water Grass Grow Refiner with Suction Cup. 1x CO2 Diffuser. Small Diffuser SIze：. Large Diffuser Size Refining bubbles, efficiently dissolving carbon, and promoting the absorption of aquatic plants.