Red Sea Reefer S-850 G3 - White Cabinet

The Red Sea Reefer S-850 G3 - White Cabinet is a premium 850 litre / 224.5 gallon reef-ready aquarium and cabinet system that pairs a large 180 cm REEFER-S G3 display with a bright white aluminum super-structure cabinet.

This base REEFER-S system is designed for aquarists building a large custom reef with carefully selected operating hardware. It includes a euro-braced 19 mm ultra-clear glass display, white aluminum cabinet, replaceable panels, slide-out control panel, split REEF-SPEC sump, ReefMat-ready mechanical filtration, ReefGate precision valve, central overflow with removable surface skimmer, curved dual returns, pre-assembled plumbing, and integrated ReefATO+ smart top-off control.

Red Sea REEFER S-850 G3 White Reef System

• Large white REEFER-S platform: The S-850 G3 offers a long 180 cm display with a clean white cabinet finish for a bright premium installation.
• 224.5 gallon total volume: The 850 L system volume provides strong stability for a mature reef with larger coral colonies and advanced equipment planning.
• Split sump flexibility: The main sump and extension section support extra filtration planning, refugium use, frag capacity, or equipment organization.
• Custom equipment freedom: Return pumps, lights, skimmer, heater, wavemakers, dosing, and controllers are chosen separately.
• G3 water-management package: Silent downflow, ReefGate control, surface skimming, optimized plumbing, and dual returns are all built into the system.
• Showpiece-ready footprint: The 180 cm length gives the reef a dramatic presence in large rooms, offices, showrooms, and dedicated aquarium spaces.

Ultra-Clear 180 cm Euro-Braced Display

• 680 litre display volume: The main display provides 179.6 gallons of aquarium space for large aquascapes, coral colonies, and selected reef fish.
• 180 x 68 x 65 cm dimensions: The long and deep footprint supports layered aquascapes, open channels, islands, caves, and broad coral zones.
• 19 mm glass panels: The S-850 G3 is listed with 19 mm front, side, bottom, and back glass.
• Euro-braced design: The bracing supports the large display while maintaining a clean professional appearance.
• Low-iron clarity: Ultra-clear glass improves viewing quality through the large panels and helps reef colours look cleaner.
• Bright cabinet contrast: The white stand visually lightens the large system while keeping focus on the display.

White Aluminum Cabinet and Control Organization

• Aluminum super-structure: The cabinet uses a rigid marine-spec aluminum frame built for large-system support.
• Replaceable white panels: The white exterior gives the aquarium a clean modern furniture-style finish.
• Hidden adjustable feet: Leveling feet help with proper installation while preserving the cabinet’s finished look.
• Slide-out control panel: The control panel supports organized mounting for controllers, power supplies, dosing equipment, and smart reef devices.
• Large equipment cabinet: The stand gives practical space for the split sump, ReefATO+, cables, controllers, and upgrades.
• Modern showpiece look: The white cabinet suits contemporary interiors and reduces the visual weight of the large aquarium.

Dual Returns and ReefGate Plumbing

• Optimized flow design: REEFER-S G3 plumbing is designed for stronger and more efficient circulation.
• Low-turbulence downflow: The enlarged rectangular inlet helps the system run more quietly.
• ReefGate precision valve: The drain can be tuned in small increments for stable water level and reduced noise.
• Central surface skimmer: The removable skimmer helps pull surface film into the filtration path.
• Curved dual return nozzles: Return outlets help spread flow across the 180 cm display.
• Ready-to-install plumbing: Included pipework reduces setup guesswork and keeps the sump area organized.

Split Sump and ReefATO+ Control

• 170 litre sump capacity: The split sump gives space for return pumps, skimmer selection, media, reactors, dosing lines, probes, and maintenance access.
• Main plus extension sump: The extension can be used for extra filtration flexibility, refugium-style planning, frag space, or other large-system needs.
• ReefMat-ready chamber: The mechanical section includes micron socks and media cups and accepts an optional ReefMat 1200.
• Integrated ReefATO+: ReefATO+ supports water-level stability, salinity control, temperature monitoring, and leak detection.
• Advanced filtration planning: The sump layout can support a high-performance skimmer, reactors, automatic filtration, and dosing equipment.
• Long-term scalability: The S-850 can be built as a refined mixed reef and upgraded into a heavily automated coral system over time.

Red Sea Reefer S-850 G3 White Specifications

• Total system volume: 850 L / 224.5 gal.
• Display volume: 680 L / 179.6 gal.
• Sump volume: 170 L / 44.9 gal.
• Display dimensions: 180 cm L x 68 cm W x 65 cm H / approx. 70.9 x 26.8 x 25.6 in.
• Total height with cabinet: 153 cm / approx. 60.2 in.
• Glass thickness: 19 mm front glass, 19 mm side glass, 19 mm bottom glass, and 19 mm back glass.
• Display format: Euro-braced ultra-clear glass aquarium.
• Cabinet: White aluminum super-structure cabinet with replaceable panels, hidden adjustable feet, stainless hardware, and slide-out control panel.
• Filtration: Split REEF-SPEC sump with main and extension sections, mechanical chamber, micron socks, media cups, ReefMat-ready layout, and integrated ReefATO+.
• Recommended return pump: 2 x Red Sea ReefRun G2 12000, sold separately.
• Recommended lighting: 4 x Red Sea ReefLED G2 170, sold separately.
• Recommended ReefMat: Red Sea ReefMat 1200, sold separately.

Application Notes for the REEFER S-850 G3 White

• Best use: Ideal for large mixed reefs, SPS-capable builds, LPS displays, soft coral systems, and premium showpiece aquariums.
• Equipment planning: Add return pumps, lighting, skimmer, heater, wavemakers, ReefMat, dosing, and test equipment before cycling.
• Lighting planning: A multi-fixture lighting layout is needed for full 180 cm x 68 cm coverage.
• Flow planning: Dedicated wavemakers are essential for coral circulation beyond the return outlets.
• Not included: Lighting, return pumps, protein skimmer, heater, wavemakers, livestock, rock, sand, salt, optional ReefMat, dosing equipment, and test kits are sold separately unless otherwise stated.

Red Sea REEFER-S G3 Series Video

Setup and Installation Notes

• Assemble and level the cabinet: Build the white aluminum cabinet according to Red Sea’s instructions before placing the aquarium.
• Plan equipment first: Select return pumps, skimmer, lighting, heater, wavemakers, optional ReefMat, and controller hardware before filling.
• Use the slide-out panel: Organize controllers and power supplies early for cleaner future service.
• Install the split sump: Confirm main sump, extension sump, plumbing, ReefGate valve, returns, and ReefATO+ are correctly installed.
• Leak test with freshwater: Test the full system before final saltwater setup.
• Tune the ReefGate carefully: Make small adjustments until the overflow runs quietly and consistently.
• Use RO/DI water: RO/DI water is recommended for salt mixing and top-off.
• Cycle before livestock: Establish biological filtration fully before adding fish or corals.

What’s Included

• Euro-braced 19 mm ultra-clear glass aquarium
• White aluminum super-structure cabinet with replaceable panels, hidden adjustable feet, stainless hardware, and slide-out control panel
• Split REEF-SPEC sump with main and extension sections, mechanical chamber, micron socks, and media cups
• Pre-assembled downflow and return plumbing with ReefGate precision valve
• Central overflow with removable surface skimmer
• Curved dual return nozzles
• Integrated ReefATO+ sensors and controller

Shipping Notes

• This item is exempt from our free shipping policy.
• To avoid delays, please order Red Sea aquariums by themselves. If you are wishing to order multiple things, please place two separate orders: one for the aquarium and one for the rest of your products.
• Please call for a shipping quote if ordering from NWT, YK, or NUN.
• All Red Sea aquariums are brought in and shipped out on an as-ordered basis. The average turn-around time to ship an aquarium to you is two business days, except where noted below.
• All shipments outside of the Vancouver area are shipped via trucking company with residential and power tailgate delivery, and are fully insured.
• Tanks ordered within BC and, in some circumstances, Alberta may take an extra 5-10 business days to process. Systems ordered from Alberta and east of there usually ship within two business days direct from the distributor in Ontario.
• If you are ordering for pick-up from our store, please select in-store pickup to avoid delivery charges. You will be notified when the tank arrives, usually within 5-10 business days.
• Red Sea Max S Series aquariums are always special order and will take from 3-6 weeks to ship.
• Please note the freight company is only responsible for getting the aquarium to the destination address and off-loading it. They are not responsible for carrying it inside.
• All freight charges have been greatly subsidized to help you get up and running with your new Red Sea system.