Red Sea Reefer 750 G3 - Black Cabinet

The Red Sea Reefer 750 G3 - Black Cabinet is a premium 750 litre / 198.1 gallon reef-ready aquarium and cabinet system for aquarists who want the largest classic REEFER G3 platform with a 180 cm euro-braced ultra-clear display and black marine-spec cabinet.

This flagship-size base REEFER G3 system provides the tank, cabinet, sump infrastructure, extension sump, plumbing, overflow, ReefGate precision drain control, ReefMat-ready mechanical filtration, and integrated ReefATO+ smart top-off foundation while leaving the final equipment package open for custom selection. It is built for serious reef keepers planning a large mixed reef, showpiece coral display, SPS-capable system, or premium long-format aquarium where lighting, flow, skimming, return pumps, dosing, and automation need to be chosen intentionally.

Red Sea REEFER 750 G3 Black Reef System

• Largest classic REEFER G3 model: The 750 G3 is the largest system in the standard REEFER G3 family, giving reef keepers a major display footprint without moving into the REEFER-S line.
• 180 cm reef display: The long aquarium provides excellent room for fish movement, multiple coral zones, large aquascape structures, and more natural reef proportions.
• 750 litre total system volume: The 198.1 gallon water volume supports high stability, more equipment planning flexibility, and a stronger foundation for mature coral growth.
• Black cabinet finish: The black cabinet creates a bold showpiece presentation and keeps the focus on coral colour, lighting, and aquascape structure.
• Base-system freedom: Return pumps, lighting, skimmer, heater, wavemakers, dosing, and automation are selected separately for a tailored large reef build.
• Dual-return planning: The 750 is designed around a dual-return configuration, making flow and return-pump planning especially important before setup.

180 cm Euro-Braced Ultra-Clear Display

• 600 litre display volume: The main display gives reef keepers a substantial canvas for larger coral colonies, showpiece aquascapes, and carefully selected reef fish.
• 180 x 65 x 60 cm dimensions: The long 180 cm length, broad 65 cm depth, and 60 cm height create a dramatic display with real room for layered reef structure.
• 19 mm glass specification: The REEFER 750 G3 is listed with 19 mm front, side, bottom, and back glass.
• Euro-braced large-system strength: The braced construction supports the large footprint while keeping the top profile clean and professional.
• Ultra-clear viewing panels: Low-iron glass improves viewing clarity across the long display and helps coral colours look cleaner.
• Flagship room presence: The 750 G3 has the visual impact needed for large living rooms, offices, showrooms, and dedicated reef installations.

G3 Dual-Return Water Management

• Hydrodynamically improved plumbing: The G3 water-management system is designed for better circulation efficiency and higher-performing movement through the aquarium and sump.
• Quiet rectangular downflow: The enlarged downflow inlet helps reduce turbulence in the overflow for quieter operation.
• ReefGate precision control: The bespoke gate valve allows fine adjustment of the main drain to stabilize water level and reduce drain noise.
• Surface-skimming overflow: The central overflow includes a removable surface skimmer for easier maintenance and cleaner water-surface management.
• Dual return layout: The 750 uses a dual-return approach for better distribution across the long display when matched with appropriate return equipment.
• Factory-designed plumbing: Pre-assembled plumbing gives the large system a clean, organized water path and reduces the uncertainty of custom plumbing.

Large Sump System and ReefATO+ Control

• 150 litre sump volume: The high-capacity sump provides extensive space for skimming, mechanical filtration, media, reactors, dosing lines, probes, return equipment, and maintenance access.
• Glass extension sump included: The REEFER 750 G3 includes a glass extension sump, giving this flagship model additional sump flexibility compared with smaller REEFER G3 systems.
• ReefMat-ready filtration: The removable mechanical chamber includes micron socks and media cups and is ready for optional automatic fleece-roll filtration.
• Integrated ReefATO+: ReefATO+ helps stabilize sump water level and salinity while adding temperature monitoring and leak detection.
• Advanced filtration planning: The large sump footprint supports a wide range of protein skimmers, media reactors, nutrient-export methods, and controller layouts.
• Built for serious reef equipment: The 750 G3 gives advanced aquarists the space and infrastructure needed for a fully featured large reef system.

Black Cabinet with Aluminum Support Structure

• Marine-spec plywood cabinet: The black cabinet is built for aquarium use with moisture-resistant construction, leveling feet, stainless steel hinges, and a finished exterior.
• Front aluminum supports: Red Sea reinforces 525 models and above with front aluminum cabinet supports, especially important for long-span systems like the 750.
• Large equipment area: The cabinet gives room for sump equipment, dual return planning, dosing containers, controller hardware, and future upgrades.
• High-contrast display look: The black finish visually anchors the 180 cm aquarium and makes reef lighting and coral colour stand out.
• Matched structural fit: The included stand is designed for the aquarium footprint and loaded system weight.
• Professional presentation: The black 750 G3 is well suited to serious home reefs, display installations, offices, and customer-facing environments.

Red Sea Reefer 750 G3 Black Specifications

• Total system volume: 750 L / 198.1 gal.
• Display volume: 600 L / 158.5 gal.
• Sump volume: 150 L / 39.6 gal.
• Display dimensions: 180 cm L x 65 cm W x 60 cm H / approx. 70.9 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, 19 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, glass extension sump, ReefMat-ready layout, and ReefATO+.
• Recommended return pump: Dual returns with 2 x Red Sea ReefRun G2 12000, sold separately.
• Lighting: Sold separately and should be selected for full 180 cm x 65 cm reef coverage.

Application Notes for the REEFER 750 G3

• Best use: Ideal for large mixed reefs, SPS-capable systems, LPS coral displays, soft coral aquariums, and showpiece reef installations.
• Equipment planning: Choose dual return pumps, lighting, skimmer, heater, wavemakers, dosing equipment, and controller hardware before filling the system.
• Lighting planning: The 180 cm length and 65 cm depth require a multi-fixture lighting plan for even coral coverage.
• Flow planning: Dedicated wavemakers are essential for reef circulation beyond the dual return system, especially in SPS or dense mixed reefs.
• Filtration planning: The large sump and extension sump provide strong flexibility for skimming, roller filtration, media, probes, dosing, and nutrient export.
• 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 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 full equipment package: Select dual return pumps, skimmer, lighting, heater, wavemakers, and optional automation before filling.
• Install plumbing carefully: Confirm the overflow, downflow, ReefGate valve, dual return plumbing, sump, extension sump, and ReefATO+ are installed correctly.
• Freshwater leak test: Run the system with freshwater before final saltwater setup to verify plumbing, sump operation, and return flow.
• Tune the ReefGate gradually: Adjust the drain valve in small increments until the overflow and sump run quietly.
• Use RO/DI water: RO/DI water is recommended for saltwater mixing and evaporation 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
• Black marine-spec plywood cabinet with leveling feet and front aluminum supports
• REEF-SPEC sump with mechanical chamber, micron socks, and media cups
• Glass extension sump
• 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.