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Red Sea

Red Sea RSK 900 Protein Skimmer

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Red Sea RSK 900 Skimmer


  • Footprint: 11.4" x 10.6" or 12.6" x 9.4"
  • Height: 23"
  • Recommended Water Height: 8" - 9"
  • Air Flow: 900 LPH (235 GPH)
  • Water Flow: 2000 LPH (530 GPH) 


Red Sea Recommends for tanks up to:

  • Light Bioload: 740 gallons
  • Medium Bioload: 500 gallons
  • Heavy Bioload (most common): 240 gallons


What's Included?

  • 1x RSK 900 Reefer Protein Skimmer Body
  • 1x RSK 900 Reefer Collection Cup with Neck Cleaner
  • 1 Meter RSK 900 Reefer Drain Hose with Valve
  • 1x RSK 900 Reefer Air Silencer with Pump Feed Hose
  • 1x Sicce PSK Pump

Red Sea Reefer Internal Protein Skimmers are designed with the hobbyist needs in mind. From quiet rubber feet, a robust air silencer, and not to mention the FoamView window with built a built-in manual neck cleaner, all which are focused towards easier maintenance along with a quieter reef tank. Starting at the top, Red Sea's Reefer Skimmers now include a built-in neck cleaner that can be manually turned to remove any build-up from the walls of the neck, while the integrated FoamView window lets you see how the foam is collecting in the neck. Along with the included cup-drain tube, emptying the collection cup is only requires a turn of a valve, and is also super easy to connect to an external waste collector. Moving down, every Red Sea Reefer Skimmer includes a Sicce PSK pump for enhanced performance and reliability that pushes a balanced amount of air and water through the hydrodynamically efficient bubble diffuser setting them up for a turbulent free ride into the collection cup. 

  • Integrated Manual Neck Cleaner
  • High Flow Air Silencer
  • Simple to Maintain and Disassemble
  • Easy to Tune Water Level Control
  • Vibration Reducing Feet and Connectors
  • Includes Collection Cup Drain Line & Valve
  • Multiple Pump Orientations for Sumps with Tight Spaces

2 Reviews

  • 5

    Posted by Fernando on Dec 16th 2022

    This unit is a beast. Love it. Simple to use. I tend to feed a lot.

  • 5
    Works fast and efficient

    Posted by Tiffany on Jul 19th 2021

    Fits perfect in my small 30 gallon sump for my 170 gallon reef. Quiet running and was easy to assemble.<br>