Fluval Sea PS2 Protein Skimmer MiniFormat: 3 L x 3 W x 10 H" (8 L x 8 W x 26 H cm), Cup dimensions 2 L x 2 W x 3 H in (5 L x 5 W x 7. 5 H cm) Compact yet powerful, the PS2 Protein Skimmer helps remove dissolved organic compounds and other harmful substances from your nano aquarium before they have a chance to break down into dangerous waste. Designed for saltwater aquariums between 5 and 20 gallons 32 needle wheel impeller increases air to water contact ratio, creating ideal bubble