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Red Sea Recommends for tanks up to:

Light Bioload - 740 gallons

Medium Bioload - 500 gallons

Heavy Bioload (most common) - 240 gallons


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



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) 


*Footprint can be changed depending on the pumps orientation inside of the skimmer body


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

RSK 900 Reefer Internal Protein Skimmer

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