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They also keep the filter vertical to prevent water from overflowing
HG957-72W: $74
Third chamber may be used for additional desired media or as a refugium
suitable for 4-21 gallon aquariums
Aquario CO2 Diffuser - Curved Special Small aquario They also keep the filterThis 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: 12mm Recommended tank size: 13 gallons Tube Height: 9"