Compact yet powerful the Fluval Mini Protein Skimmer helps to remove dissolved organic compounds and other harmful substances from your aquarium before they have a chance to break down into dangerous nitrogenous waste which can be harmful to aquarium inhabitants. The skimmer\'s large reaction chamber allows the air and water to mix effectively to efficiently strip the organic waste from water molecules while its unique 32 needle-wheel impeller is designed to produce the optimal bubble size for maximum protein collection. Key Features : For aquariums 20-80 L (5-20 US Gal.). Compact powerful efficient. Effectively removes organic waste. Great for all small marine aquariums. Adjustable Air Intake and Water Level Regulators Bubble Trap: controls and reduces fine bubbles. Clear-View Collection Cup: removes easily for emptying and cleaning. Large Reaction Chamber: mixes air and water effectively32-needle wheel Impeller: produces optimal bubble size. Versatile mounting options. Easy to Install. Modular design allows full and easy access for maintenance and cleaning. Colour: Black. Compatible with the Fluval EVO XII Aquarium - 10531. Size: 8 x 8 x 26 cm (3\" x 3\" x 10\").