Red Sea Reefer 625 G3 - Black Cabinet

The Red Sea Reefer 625 G3 - Black Cabinet is a premium 620 litre / 163.8 gallon reef-ready aquarium and cabinet system for aquarists who want a deeper 150 cm Red Sea REEFER G3 display with a black marine-spec cabinet and high-capacity sump-based infrastructure.

With a 150 cm length, 65 cm depth, and 60 cm display height, the REEFER 625 G3 provides a larger and deeper reef canvas than the 525 while preserving the custom-equipment freedom of the base REEFER line. It includes a euro-braced ultra-clear aquarium, black marine-spec plywood cabinet with front aluminum supports, REEF-SPEC sump, ReefMat-ready mechanical chamber, ReefGate precision valve, improved G3 plumbing, central overflow with removable surface skimmer, curved dual returns, and integrated ReefATO+ smart top-off control.

Red Sea REEFER 625 G3 Black Reef System

• Large deep-display reef platform: The REEFER 625 G3 adds both depth and height, creating a more spacious reef layout for aquarists who want a serious showpiece system.
• 620 litre total system volume: The 163.8 gallon system volume provides substantial stability and more flexibility for coral growth, livestock selection, nutrient management, and long-term reef planning.
• Black cabinet finish: The black cabinet gives the aquarium a bold, high-contrast display look and helps conceal the equipment area visually.
• Custom hardware freedom: Lighting, return pump, protein skimmer, heater, wavemakers, and automation are chosen separately so the build can match the intended reef style.
• Euro-braced strength: The larger G3 display uses euro-bracing and thick ultra-clear glass to support a premium large-format aquarium design.
• Ideal for advanced mixed reefs: The footprint and sump capacity make this system well suited for LPS displays, mixed reefs, soft coral systems, and carefully planned SPS-capable builds.

150 x 65 cm Euro-Braced Ultra-Clear Display

• 497 litre display volume: The main aquarium gives reef keepers a broad display area for coral colonies, open sand zones, island structures, swim-throughs, and selected reef fish.
• 65 cm front-to-back depth: The deeper footprint gives more room for layered rockwork, negative-space aquascaping, and coral placement without crowding the front glass.
• 60 cm display height: The added height increases visual presence and gives corals more vertical room to grow.
• 19 mm viewing glass: The 625 G3 is listed with 19 mm front, side, and back glass and a 15 mm bottom panel.
• Ultra-clear viewing: Low-iron glass improves clarity and coral colour presentation through the thick viewing panels.
• Clean cabinet-contained equipment: The sump and equipment are housed below the display so the reef remains visually clean.

G3 Flow Architecture and Quiet Operation

• Optimized water circulation: REEFER G3 systems use redesigned plumbing for improved circulation efficiency and stronger water movement through the system.
• Quiet downflow system: The enlarged rectangular downflow inlet helps reduce turbulence and operating noise in the overflow.
• ReefGate precision valve: The bespoke drain valve allows fine tuning of the downflow line for stable water height and near-silent sump operation.
• Surface-skimming overflow: The central overflow includes a removable surface skimmer to help clear surface film and support gas exchange.
• Curved dual returns: Improved return nozzles distribute water back into the display and provide a strong starting point for additional reef circulation.
• Pre-assembled plumbing: Factory-designed plumbing simplifies setup and gives the large system a cleaner drain and return path.

High-Capacity REEF-SPEC Sump and ReefATO+

• 123 litre sump volume: The large sump provides substantial space for skimmer selection, return equipment, mechanical filtration, media, probes, reactors, dosing, and maintenance access.
• ReefMat-ready chamber: The removable mechanical filtration compartment includes micron socks and media cups and is designed for optional Red Sea ReefMat installation.
• Integrated ReefATO+: ReefATO+ helps maintain stable sump water level and salinity while adding temperature monitoring and leak detection.
• Flexible filtration planning: The sump can support protein skimming, media reactors, carbon, refugium-style nutrient export, dosing lines, and monitoring equipment.
• Large-system maintenance access: The in-cabinet sump gives the space needed to service larger equipment more comfortably.
• Advanced reef-ready foundation: The 625 G3 gives experienced hobbyists a strong base for a high-performance Red Sea ecosystem build.

Black Cabinet with Front Aluminum Supports

• Marine-spec plywood construction: The cabinet is designed for aquarium use with leveling feet, moisture-resistant construction, stainless steel hinges, and a finished black exterior.
• Aluminum front support system: The 625 G3 uses front aluminum cabinet supports for added rigidity across the larger span.
• Strong visual contrast: The black finish frames coral colour and reef lighting while making the equipment area look less prominent.
• Room for equipment planning: The larger cabinet provides room for sump equipment, ATO hardware, controller boards, dosing lines, and future upgrades.
• Matched stand confidence: The included cabinet is designed for the aquarium footprint and avoids the risk of an unsuitable support structure.
• Polished room presentation: The black cabinet creates a professional display for homes, offices, showrooms, and dedicated aquarium rooms.

Red Sea Reefer 625 G3 Black Specifications

• Total system volume: 620 L / 163.8 gal.
• Display volume: 497 L / 131.2 gal.
• Sump volume: 123 L / 32.5 gal.
• Display dimensions: 150 cm L x 65 cm W x 60 cm H / approx. 59.1 x 25.6 x 23.6 in.
• Total height with cabinet: 148 cm / approx. 58.3 in.
• Glass thickness: 19 mm front glass, 19 mm side glass, 15 mm bottom glass, and 19 mm back glass.
• Display format: Euro-braced ultra-clear glass aquarium.
• Cabinet: Black marine-spec plywood cabinet with leveling feet and front aluminum supports.
• Filtration: REEF-SPEC sump with mechanical chamber, micron socks, media cups, ReefMat-ready layout, and ReefATO+.
• Recommended return pump: Red Sea ReefRun G2 12000, sold separately.
• Lighting: Sold separately and should be selected for full 150 cm x 65 cm reef coverage.

Application Notes for the REEFER 625 G3

• Best use: Ideal for larger mixed reefs, LPS systems, soft coral displays, SPS-capable builds, and customers wanting a deep large-format reef-ready platform.
• Equipment planning: Add lighting, return pump, skimmer, heater, wavemakers, and testing equipment before setup and cycling.
• Flow planning: A tank this deep benefits from planned wavemaker placement to move water behind rockwork and across coral zones.
• Lighting planning: Choose lights for both the 150 cm length and 65 cm depth so coral coverage remains even across the aquascape.
• Filtration upgrade path: The large ReefMat-ready sump gives a practical path toward automatic mechanical filtration and more advanced nutrient control.
• 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 black cabinet according to Red Sea’s instructions and confirm it is level before placing the aquarium.
• Plan the hardware package: Choose return pump, skimmer, lighting, heater, wavemakers, and optional automation before filling.
• Install plumbing and sump components: Confirm the overflow, downflow, ReefGate valve, return plumbing, sump, and ReefATO+ components are installed correctly.
• Leak test first: Run the system with freshwater before adding saltwater, rock, or livestock.
• Tune the drain slowly: Make small ReefGate adjustments until water level and overflow sound are stable.
• Use RO/DI water: Use RO/DI water for salt mixing and top-off to help maintain stable reef chemistry.
• Cycle before livestock: Establish biological filtration before adding fish or corals, then stock gradually.

What’s Included

• Euro-braced ultra-clear glass aquarium
• Black marine-spec plywood cabinet with leveling feet and front aluminum supports
• 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.