The Rio 200 Power CO2+ Reactor Surface Skimmer is a great way to both introduce CO2 and skim the surface in a freshwater planted tank. This version attaches to the inside of the tank with a magnet mount. The CO2 bottle, bubble counter, check valve and airline hose are NOT included. User Manual For aquariums up to 36" deep Suction cup attachment Skims the surface of the tank, helping to increase light penetration to the plants Produces ultra-fine CO2 bubbles in the CO2 reaction chamber (CO2 bottle, bubble counter, check valve and airline hose are NOT included. Connects easily to any CO2 source Clog resistant venturi Simple and easy to set up