Red Sea Reefer 350 G3 - Black Cabinet

The Red Sea Reefer 350 G3 - Black Cabinet is a premium 342 litre / 90.3 gallon reef-ready aquarium and cabinet system for aquarists who want the largest rimless model in Red Sea’s classic REEFER G3 range with a black marine-spec cabinet.

The REEFER 350 G3 gives reef keepers a longer 120 cm ultra-clear display while preserving the clean rimless styling of the smaller G3 systems. It includes a black 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. This base REEFER configuration is ideal for customers who want a premium tank, cabinet, sump, and plumbing foundation while selecting their own lighting, return pump, skimmer, heater, wavemakers, and reef automation separately.

Red Sea REEFER 350 G3 Black Reef System

• Largest rimless REEFER G3 model: The 350 is the largest classic G3 system before the line transitions into euro-braced models, making it appealing for customers who prefer a clean rimless display.
• 120 cm reef canvas: The longer display gives more horizontal swimming room, more coral placement space, and better visual spread than the 90 cm systems.
• 342 litre total volume: The added water volume supports greater stability, more equipment planning flexibility, and more long-term coral growth potential.
• Black cabinet finish: The black cabinet visually grounds the aquarium and helps create a high-contrast display where coral colour and lighting stand out.
• Custom equipment freedom: Lighting, return pump, skimmer, heating, flow, and automation can be selected around the intended reef instead of being bundled into the base system.
• Excellent mixed reef foundation: The 350 provides a strong platform for soft coral systems, LPS reefs, mixed reefs, and carefully planned SPS-leaning builds with proper equipment choices.

120 cm Ultra-Clear Rimless Display

• 273 litre display volume: The larger display supports a more mature aquascape with broader coral spacing and improved fish movement.
• 120 x 50 x 53 cm dimensions: The longer footprint is well suited to island rockwork, long reef ridges, open channels, and coral zones separated by flow and lighting requirements.
• 12 mm front and bottom glass: The 350 G3 is listed with 12 mm front glass, 15 mm side glass, and 12 mm bottom glass.
• Ultra-clear viewing: Low-iron glass improves visibility and reduces tint for cleaner coral colour and fish presentation.
• Rimless open-top look: The braceless design keeps the tank modern and clean while providing excellent access for maintenance and aquascaping.
• Hidden equipment below: The cabinet sump keeps filtration equipment out of the display and gives the aquarium a clean room-facing presentation.

G3 Flow System and Quiet Water Management

• Hydrodynamically optimized piping: REEFER G3 systems use improved plumbing and return architecture for better flow efficiency.
• Quiet downflow inlet: The enlarged rectangular inlet helps reduce turbulence in the drain line for quieter running.
• ReefGate precision valve: The bespoke gate valve allows fine drain adjustment for stable, near-silent operation.
• Surface skimming overflow: The central overflow includes a removable surface skimmer to help keep the water surface clear.
• Curved dual return outlets: Improved returns distribute water across the longer display and complement added wavemaker flow.
• Factory-designed plumbing: The pre-assembled plumbing provides a cleaner starting point than designing a custom sump connection from scratch.

REEF-SPEC Sump and ReefATO+ Automation

• 69 litre sump volume: The sump gives more room for filtration equipment, skimmer selection, return pump installation, media, dosing lines, and optional automation.
• ReefMat-ready design: The mechanical chamber includes micron socks and media cups and is prepared for optional Red Sea ReefMat automatic fleece-roll filtration.
• Integrated ReefATO+: ReefATO+ helps keep water level and salinity stable and includes temperature monitoring and leak detection.
• Flexible filtration capacity: The sump supports carbon, media reactors, refugium-style planning, skimming, probes, and long-term filtration upgrades.
• Service-friendly cabinet layout: The under-tank sump makes regular maintenance easier while keeping the display uncluttered.
• Red Sea ecosystem ready: The 350 G3 works well with optional ReefRun, ReefLED, ReefMat, ReefWave, ReefDose, and ReefBeat-connected equipment.

Red Sea Reefer 350 G3 Black Specifications

• Total system volume: 342 L / 90.3 gal.
• Display volume: 273 L / 72.1 gal.
• Sump volume: 69 L / 18.2 gal.
• Display dimensions: 120 cm L x 50 cm W x 53 cm H / approx. 47.2 x 19.7 x 20.9 in.
• Total height with cabinet: 140 cm / approx. 55.1 in.
• Glass thickness: 12 mm front glass, 15 mm side glass, 12 mm bottom glass.
• Display format: Rimless ultra-clear glass aquarium.
• Cabinet: Black 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: Red Sea ReefLED G2 170, sold separately.
• Recommended ReefMat: Red Sea ReefMat 500, sold separately.

Application Notes for the REEFER 350 G3

• Best use: Ideal for aquarists wanting a longer rimless reef aquarium for soft corals, LPS corals, mixed reefs, and larger aquascapes.
• Lighting planning: The recommended ReefLED G2 170 is sold separately, and lighting should be planned around coral goals and full 120 cm coverage.
• Flow planning: The longer display benefits from well-placed wavemakers to support flow across the full aquascape.
• Filtration path: The ReefMat-ready sump gives a strong upgrade path for customers wanting automatic mechanical filtration.
• Base package advantage: This model is ideal for customers who want a professional Red Sea foundation without paying for bundled equipment they may replace later.
• 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 the system is level before filling.
• Plan the full hardware package: Choose lighting, return pump, skimmer, heater, and wavemakers before cycling.
• Install plumbing correctly: Confirm the overflow, downflow, ReefGate valve, return plumbing, sump, and ReefATO+ are installed properly.
• Leak test first: Run freshwater through the system before final saltwater setup to verify plumbing and sump operation.
• Tune the ReefGate: Adjust the valve slowly for stable, quiet downflow performance.
• 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

• Ultra-clear rimless glass aquarium
• Black 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.