Red Sea Reefer 425 G3 - White Cabinet

The Red Sea Reefer 425 G3 - White Cabinet is a premium 433 litre / 114.4 gallon reef-ready aquarium and cabinet system that combines Red Sea’s larger euro-braced REEFER G3 display with a bright white marine-spec cabinet.

This 120 cm base REEFER G3 system is designed for aquarists who want a serious reef-ready tank, sump, cabinet, and plumbing platform while choosing their preferred light, pump, skimmer, heater, flow, dosing, and control equipment separately. It includes a euro-braced ultra-clear glass aquarium, white marine-spec plywood cabinet, REEF-SPEC sump, ReefMat-ready mechanical filtration chamber, pre-assembled plumbing, ReefGate precision valve, central overflow with removable surface skimmer, curved dual return nozzles, and integrated ReefATO+ smart top-off control.

Red Sea REEFER 425 G3 White Reef System

• Large euro-braced REEFER platform: The 425 G3 offers 433 L of total system volume and a substantial 120 cm by 60 cm display for aquarists wanting more reef capacity.
• White cabinet finish: The white marine-spec cabinet gives the larger aquarium a clean, modern, lighter visual profile.
• 114.4 gallon total volume: The larger volume supports better stability and more flexible livestock, coral, and filtration planning than smaller systems.
• Custom equipment selection: The base REEFER format lets customers choose the return pump, skimmer, lighting, heater, wavemakers, and automation that best fit their reef.
• Euro-braced display strength: The 425 is part of Red Sea’s G3 euro-braced range for additional structural support on larger aquariums.
• Strong long-term reef foundation: The system provides enough size and sump capacity for a refined mixed reef or coral-focused custom build.

120 cm Ultra-Clear Euro-Braced Display

• 343 litre display volume: The larger display gives aquarists more space for coral colonies, rockwork, open swimming lanes, and long-term growth.
• 60 cm display depth: The wider footprint makes it easier to build a natural-looking reef with depth, open space, islands, ledges, and multiple coral zones.
• Euro-braced glass construction: The braced format adds strength while keeping the system clean and professional looking.
• Glass thickness specification: The 425 G3 is listed with 12 mm front glass, 15 mm side glass, 12 mm bottom glass, and 12 mm back glass.
• Ultra-clear viewing panels: Low-iron glass supports a cleaner view of coral fluorescence, fish colour, and aquascape detail.
• White cabinet styling: The cabinet creates a bright furniture-style presentation while keeping equipment hidden below the display.

G3 Water Management and ReefGate Tuning

• Optimized G3 plumbing: The redesigned water-management system improves circulation efficiency and supports better water movement through the sump.
• Quiet downflow system: The rectangular downflow inlet is designed to reduce turbulence and operating noise.
• ReefGate precision valve: Fine drain control allows the overflow and sump level to be tuned for quiet consistent performance.
• Surface-skimming overflow: The central overflow includes a removable surface skimmer that helps pull film and floating debris into the filtration system.
• Curved dual returns: Improved return nozzles help spread water across the larger display footprint.
• Pre-assembled plumbing: Included pipework provides a clean, factory-designed installation path for the drain and return system.

Large REEF-SPEC Sump and ReefATO+

• 90 litre sump: The in-cabinet sump provides generous space for return equipment, skimmer selection, mechanical filtration, media, reactors, dosing, and monitoring.
• ReefMat-ready mechanical chamber: The sump includes micron socks and media cups and is designed for optional Red Sea ReefMat installation.
• Integrated ReefATO+: ReefATO+ helps manage evaporation-driven water level changes and salinity stability while adding temperature monitoring and leak detection.
• Flexible filtration planning: The sump can support a simple mixed reef or a more advanced equipment-heavy system depending on customer goals.
• Cleaner service access: The cabinet sump makes skimmer maintenance, filter service, equipment swaps, and dosing-line routing more practical.
• Red Sea ecosystem ready: Optional ReefRun, ReefLED, ReefWave, ReefDose, ReefMat, REEFER skimmers, and ReefBeat-connected devices can be added as the reef evolves.

Red Sea Reefer 425 G3 White Specifications

• Total system volume: 433 L / 114.4 gal.
• Display volume: 343 L / 90.6 gal.
• Sump volume: 90 L / 23.8 gal.
• Display dimensions: 120 cm L x 60 cm W x 55 cm H / approx. 47.2 x 23.6 x 21.7 in.
• Total height with cabinet: 142 cm / approx. 55.9 in.
• Glass thickness: 12 mm front glass, 15 mm side glass, 12 mm bottom glass, 12 mm back glass.
• Display format: Euro-braced ultra-clear glass aquarium.
• Cabinet: White marine-spec plywood cabinet with leveling feet.
• Filtration: REEF-SPEC sump with mechanical chamber, micron socks, media cups, ReefMat-ready layout, and ReefATO+.
• Recommended return pump: Red Sea ReefRun G2 6000, sold separately.
• Recommended lighting: 2 x Red Sea ReefLED G2 170, sold separately.
• Recommended ReefMat: Red Sea ReefMat 500, sold separately.

Application Notes for the REEFER 425 G3 White

• Best use: Ideal for larger mixed reef aquariums, LPS coral displays, soft coral systems, and custom reef builds requiring more water volume and depth.
• Lighting planning: Choose reef lighting for full 120 cm by 60 cm coverage based on coral goals and mounting preference.
• Flow planning: Add wavemakers to support broad circulation beyond the dual returns, especially for dense rockwork or SPS-heavy sections.
• Filtration planning: The 90 L sump gives space for a skimmer, media, probes, dosing lines, and optional ReefMat filtration.
• Base package advantage: This system is best for customers who want the Red Sea tank and sump infrastructure but prefer selecting their own equipment package.
• Not included: Lighting, return pump, protein skimmer, heater, wavemakers, livestock, rock, sand, salt, optional ReefMat, dosing equipment, and test kits are sold separately unless otherwise stated.

Red Sea REEFER G3 Series Video

Setup and Installation Notes

• Assemble and level the cabinet: Build the white cabinet according to Red Sea’s instructions and confirm it is level before installing the aquarium.
• Plan the full equipment package: Select the return pump, skimmer, lighting, heater, wavemakers, and optional automation before filling.
• Install plumbing carefully: Confirm the overflow, downflow, ReefGate valve, return plumbing, sump, and ReefATO+ components are installed properly.
• Freshwater leak test: Run the system with freshwater before saltwater setup to verify plumbing, sump level, and return flow.
• Tune the drain slowly: Adjust the ReefGate valve in small increments until the overflow and sump run quietly.
• Use RO/DI water: RO/DI water is recommended for saltwater mixing and top-off.
• Cycle before livestock: Establish biological filtration before adding fish or corals, then stock gradually.

What’s Included

• Euro-braced ultra-clear glass aquarium
• White marine-spec plywood cabinet with leveling feet
• REEF-SPEC sump with 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.