RedSea Reefer Skimmer 300 RSK-300Amazing new Skimmer from Red Sea, RSK 300, designed for up to 300 litres of SPS tanks, 600litres for Mixed Reef or 900 for fish only Total Height53cm Base23x21cm SPS: 300 LItres Mixed Reef: 600 Litres Fish Only: 900 Litres Ergonomic diffusion chamber evenly disperses the fine bubbles created by the PSK pump across the skimmer cone, without reducing air or water flow. Quiet operation, with vibration absorbing components and a large air intake silencer.