Red Sea RSK 600 — REEFER Skimmer Sicce PSK-1000 Mixed Reef 320 gal - Red Sea

The Red Sea RSK 600 REEFER Skimmer protein skimmer is the mid-range model of the REEFER Skimmer line, designed for reef aquariums up to 600 liters (160 gallons) with heavy SPS loads and up to 1,200 liters (320 gallons) for mixed reefs. Equipped with the Sicce PSK-1000 needlewheel pump with an oversized venturi, it produces a finely dispersed air-water mixture through a high-performance reaction chamber that maintains an ORP (REDOX) level above 350 mV — a level normally associated with ozone treatment, without ozone.

Video — Red Sea REEFER Skimmer

Capacity by biological load

The "600" in RSK 600 refers to the capacity in liters for a heavy-load SPS aquarium. Actual capacity varies depending on your reef type:

• SPS / Heavy load: Up to 600 L (160 gal) — Acropora, Montipora, frequent feeding
• Mixed reef / Medium load: Up to 1,200 L (320 gal) — Combined SPS, LPS, soft corals
• Fish only / Light load: Up to 1,800 L (500 gal) — Fish tank with few corals

RSK 600 vs RSK 300 — Why upgrade?

The RSK 600 doubles the capacity of the RSK 300 thanks to a more powerful pump (Sicce PSK-1000 vs PSK-600) and a larger reaction chamber. Air flow increases from 500 to 700 L/h and water flow from 1,000 to 1,500 L/h, which significantly increases air-water contact time and the amount of organic waste extracted. If your aquarium exceeds 80 gallons with a heavy SPS load or 160 gallons with a mixed reef, or if you feed your corals and fish heavily, the RSK 600 is the right choice.

Why the RSK 600 stands out from the competition

Noise reduction — Concrete efforts

Red Sea has integrated several elements to reduce operating noise: an oversized air intake silencer on the venturi inlet, anti-vibration rubber feet, and vibration-absorbing connectors between each component. The sound level varies depending on the installation (sump type, surface under the skimmer, cabinet resonance). As the PSK-1000 pump is more powerful than the PSK-600, it naturally produces more air noise. For reefers who want to go further in silence, upgrading to the DC pump (sold separately) offers significantly smoother operation.

FoamView window and integrated neck cleaner

The collection cup incorporates two innovations that change daily maintenance. The FoamView window allows you to see the foam rising in the neck without removing the cup. The integrated neck cleaner in the lid is a rotating bar with a thick double-sided rubber scraper that removes accumulation on the neck walls in a few rotations. With the drain port and its 1-meter hose with valve, you can empty the cup into an external container without ever removing it.

Hydrodynamic diffusion chamber

The diffusion plate at the bottom of the reaction chamber has numerous and prominent outlet holes that uniformly disperse the fine bubbles created by the PSK pump throughout the cone. This design does not reduce either air flow or water flow, maximizing air-water contact time for optimal extraction of organic waste and proteins.

Assembly and maintenance designed for reefers

Red Sea uses custom short-threaded nylon screws — just a few turns are needed to tighten them, and the wide thread prevents salt particles from getting stuck. The Sicce PSK-1000 pump removes with a click thanks to the click-in/out bracket for quick cleaning. The cup locks into the neck with a sealed snap compression. The pump's cable routing neatly tucks into the bracket without trailing in the sump water.

3 orientation options

The symmetrical base of the conical body can be installed in 3 different orientations to position the pump's water intake and the control valve wherever you want in your sump. Whether your sump is narrow with left, right, or front access, there is an optimal configuration.

Designed for the Red Sea REEFER ecosystem

The RSK 600 integrates perfectly into the skimmer chamber of Red Sea REEFER systems. The water level indicator on the skimmer regulator precisely matches the water level inside the REEFER sump — everything is calibrated to work together. Compatible with REEFER 350, REEFER 425, REEFER 525, REEFER 625, and REEFER Peninsula (G1, G2, and G2+) models. Also works in any third-party sump with a water height of 18 to 20 cm (7 to 8 inches).

Technical specifications

• Model: RSK-600
• Pump: Sicce PSK-1000 needlewheel (AC)
• Air flow: 700 L/h (195 GPH)
• Water flow: 1,500 L/h (400 GPH)
• Maintained ORP: 350+ mV
• Height: 56 cm (22 in)
• Footprint: 26 x 24 cm (10.2 x 9.4 in) or 29 x 21 cm (11.4 x 8.3 in) depending on orientation
• Recommended water height: 18 to 20 cm (7 to 8 in)
• Skim regulator: Notched precision valve controlling water level in the reaction chamber
• Materials: Transparent acrylic, saltwater resistant components

Box contents

• 1 x RSK 600 skimmer body with conical reaction chamber
• 1 x Sicce PSK-1000 pump with click-in/out bracket
• 1 x Collection cup with FoamView window and integrated neck cleaner
• 1 x Oversized air intake silencer with supply hose
• 1 x 1-meter drain hose with valve
• Assembly base with 3 orientation options
• Short-threaded nylon screws and hardware
• User manual

DC upgrade available

The RSK 600 can be upgraded with the Red Sea REEFER DC Skimmer pump, which replaces the original Sicce PSK-1000 AC pump. The DC pump offers significantly smoother operation, reduced power consumption (25W), an air flow of 750 L/h with variable flow controlled via the ReefBeat app, and the Self-Leveling feature that automatically adjusts skimmer intensity to prevent foam overflow. The ReefRun Dual controller is required (sold separately).

Why choose ReefSolution

Authorized Red Sea dealer in Canada with technical support in French. Complementary products available: Red Sea REEFER DC Skimmer Pump — DC upgrade pump with ReefBeat control and Self-Leveling, Red Sea RSK 900 REEFER Skimmer — Superior model for larger reef systems, Red Sea ReefMat — Automated mechanical filtration for REEFER sumps, Red Sea Coral Pro Salt — Reef salt formulated for REEFER systems. Shipping across Canada.

Frequently asked questions

Is the RSK 600 the right choice for a REEFER 425 or a 150-gallon aquarium?

Yes. The RSK 600 is recommended by Red Sea for mixed reefs up to 320 gallons. For a REEFER 425 (110 gallons) or a 150-gallon aquarium with a heavy SPS load, the RSK 600 offers ideal capacity. It is also the recommended model for the REEFER 350, REEFER 525, and REEFER Peninsula G2.

Will the RSK 600 fit in my sump?

The footprint is 26 x 24 cm (10.2 x 9.4 in) or 29 x 21 cm (11.4 x 8.3 in) depending on the chosen orientation from the 3 assembly options. Measure your skimmer chamber and choose the orientation that fits. In REEFER sumps, the RSK 600 is designed to integrate perfectly.

How do I adjust the RSK 600 skimmer?

The Sicce PSK-1000 AC pump operates at a fixed speed. Skimming adjustment is done via the notched precision valve that controls the water level inside the reaction chamber. By raising the water level, the foam is pushed higher into the neck for wetter skimming. By lowering the level, the foam rises less for drier skimming. During break-in (first 1-2 weeks), set the valve for a lower water level to allow the skimmer to stabilize. After break-in, gradually raise the level to achieve dense and stable foam in the neck. Use the FoamView window to monitor without touching the cup.

Can I upgrade the AC pump to the DC pump later?

Yes. The Red Sea REEFER DC Skimmer pump is a direct replacement for the PSK-1000 AC pump. It connects to the ReefRun Dual controller (sold separately) and offers variable flow, an automatic Self-Leveling function, and integration with the ReefBeat app for remote control.