Aquario CO2 Diffuser - Normal Special Large Aquarium it provides at least 20

it provides at least 20 hours of constant supply of oxygen for the tank

Its all natural formula contains humic acid

Firm scrub brush for sweeping air stone

and it is easy to suck the feces away

Aquario CO2 Diffuser - Normal Special Large Aquarium it provides at least 20This CO2 diffuser dissolves carbon dioxide into a fine mist of bubbles which allows for better dissolution in your water column. This CO2 diffuser is available in 3 different sizes. Notes: Soak the diffuser in water for 30 minutes before using to produce finer bubbles. Smaller chamber gives a low profile appearance. Diameter: 24mm Recommended tank size: 32+ gallons