Red Sea Reefer 525 G3 - White Cabinet

The Red Sea Reefer 525 G3 - White Cabinet is a premium 540 litre / 142.7 gallon reef-ready aquarium and cabinet system designed for aquarists who want a large euro-braced REEFER G3 display with a bright white marine-spec cabinet.

This base REEFER G3 system gives hobbyists the Red Sea tank, cabinet, sump, plumbing, overflow, ReefGate precision drain valve, ReefMat-ready filtration section, and integrated ReefATO+ smart top-off hardware while leaving lighting, return pump, skimmer, heater, wavemakers, dosing, and control equipment open for custom selection. It is a strong choice for reef keepers who want a polished large-format system without being locked into a pre-bundled equipment package.

Red Sea REEFER 525 G3 White Reef System

• Large 150 cm REEFER platform: The REEFER 525 G3 gives customers a substantial reef display with enough length for larger aquascapes, broader coral placement, and more natural fish movement.
• 142.7 gallon total system volume: The 540 L water volume provides the stability and scale needed for a more mature mixed reef or coral-focused display.
• White cabinet finish: The white marine-spec cabinet gives the system a clean, bright, modern appearance that suits contemporary homes, offices, and display spaces.
• Euro-braced construction: The 525 belongs to Red Sea’s larger euro-braced G3 range, giving the display added structural support in a clean premium format.
• Base equipment freedom: The system is supplied as a tank, stand, sump, plumbing, and ATO foundation so customers can choose the exact hardware package they prefer.
• Premium upgrade path: The REEFER 525 G3 is ready for a Red Sea smart ecosystem build with optional ReefRun, ReefLED, ReefWave, ReefMat, ReefDose, and ReefBeat-connected hardware.

Ultra-Clear Euro-Braced Display

• 423 litre display volume: The display provides room for larger coral colonies, open swimming lanes, layered rockwork, and more thoughtful livestock planning.
• 150 x 60 x 55 cm dimensions: The broad 60 cm depth makes it easier to build a reef with caves, open sand, island structures, and front-to-back coral zones.
• 15 mm glass panels: The 525 G3 is listed with 15 mm front, side, bottom, and back glass.
• Ultra-clear low-iron viewing: Reduced glass tint helps coral colour, fish movement, and aquascape detail look cleaner through the panels.
• Large display presence: The 150 cm length gives the aquarium a room-dominating reef look without moving into the longest 180 cm footprint.
• Hidden sump equipment: The white cabinet houses filtration and support equipment below the display so the visible aquarium stays clean and reef-focused.

G3 Water Management and Quiet ReefGate Tuning

• Improved G3 circulation: Red Sea’s updated plumbing and return architecture are designed to move water more efficiently through the system.
• Silent downflow design: The enlarged rectangular drain inlet helps reduce turbulence and makes the system easier to tune quietly.
• ReefGate precision valve: Fine drain control allows the overflow level to be adjusted for stable, near-silent operation.
• Surface-skimming overflow: The central overflow with removable surface skimmer helps pull surface film into the filtration system.
• Curved return nozzles: Dual curved returns improve water distribution back into the display and complement dedicated reef wavemakers.
• Pre-assembled pipework: The included plumbing gives the system a clean, factory-designed water path from display to sump and back.

REEF-SPEC Sump and ReefATO+ Stability

• 116 litre sump volume: The larger sump gives room for skimmer selection, return equipment, mechanical filtration, chemical media, probes, dosing lines, and maintenance access.
• ReefMat-ready mechanical chamber: The removable filtration compartment 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 providing temperature monitoring and leak detection.
• Flexible filtration design: The sump supports carbon, reactors, refugium-style planning, protein skimming, and future equipment upgrades.
• Clean service workflow: The cabinet sump layout keeps maintenance accessible without cluttering the display area.
• Built for a growing reef: The system can start as a simple mixed reef and grow into a more automated coral-focused display over time.

White Marine-Spec Cabinet with Aluminum Supports

• Bright furniture-style look: The white cabinet visually lightens the large aquarium and works well in modern, open, or minimalist rooms.
• Marine-spec plywood build: The cabinet is designed for aquarium use with moisture-resistant construction, leveling feet, stainless steel hinges, and a clean exterior finish.
• Front aluminum supports: Red Sea reinforces 525 models and above with front aluminum cabinet supports to improve rigidity on larger systems.
• Organized equipment space: The cabinet keeps sump, plumbing, ATO hardware, and optional accessories contained below the display.
• Better installation confidence: The included matching stand removes the uncertainty of pairing a large aquarium with an unsuitable generic cabinet.
• Display-ready presentation: The white cabinet creates a polished installation suitable for homes, offices, and customer-facing display areas.

Red Sea Reefer 525 G3 White Specifications

• Total system volume: 540 L / 142.7 gal.
• Display volume: 423 L / 111.7 gal.
• Sump volume: 116 L / 30.6 gal.
• Display dimensions: 150 cm L x 60 cm W x 55 cm H / approx. 59.1 x 23.6 x 21.7 in.
• Total height with cabinet: 142 cm / approx. 55.9 in.
• Glass thickness: 15 mm front glass, 15 mm side glass, 15 mm bottom glass, and 15 mm back glass.
• Display format: Euro-braced ultra-clear glass aquarium.
• Cabinet: White 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 8000, sold separately.
• Lighting: Sold separately and should be selected for full 150 cm x 60 cm reef coverage.

Application Notes for the REEFER 525 G3 White

• Best use: Ideal for larger mixed reefs, LPS systems, soft coral displays, and SPS-capable builds when matched with appropriate lighting, flow, and filtration equipment.
• Equipment selection: Add a return pump, protein skimmer, lighting, heater, wavemakers, and test kits before cycling the aquarium.
• Lighting planning: Choose lighting based on coral goals, spread requirements, mounting preference, and the full 150 cm display length.
• Flow planning: Use dedicated wavemakers for coral circulation beyond sump turnover, especially in dense aquascapes.
• Filtration upgrade path: The ReefMat-ready sump supports future automatic mechanical filtration without replacing the system.
• 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.
• Choose equipment before filling: Select the return pump, skimmer, heater, lighting, flow pumps, and optional automation before starting the reef.
• Install plumbing carefully: Confirm the overflow, downflow, ReefGate valve, return plumbing, sump, and ReefATO+ are installed properly.
• Freshwater leak test: Run the system with freshwater first to verify plumbing, sump level, and return flow before adding saltwater.
• Tune the ReefGate slowly: 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
• White 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.