Red Sea Reefer S-850 G3 – Premium Reef-Ready Aquarium System

A breathtaking 850 L professional reef system built for the ultimate display of strength, stability, and sophistication.

The Red Sea Reefer S-850 G3 stands at the pinnacle of Red Sea’s S-Series aquariums — combining all the intelligent G3 features with expanded dimensions, enhanced structure, and unmatched visual impact.

Featuring a marine-grade aluminium super-structure, Euro-Brace reinforced ultra-clear glass, slide-out control panel, and refined hydrodynamic plumbing, the S-850 G3 offers the ultimate foundation for large-scale coral ecosystems. Every detail is engineered for reliability, silence, and elegance — making it the statement centrepiece of any reef enthusiast’s home or showroom.

Key Benefits

Flagship S-Series Strength – A reinforced aluminium frame and Euro-Brace system deliver maximum rigidity, supporting ultra-clear glass panels up to 19 mm thick.

Deeper, Wider, More Immersive – The S-850’s expanded proportions create a stunning panoramic reef view with superior water volume for coral stability.

Smart & Connected Control – The built-in ReefATO+ automatically maintains water level, tracks temperature, and detects leaks — all via the ReefBeat® app.

Silent Performance – The redesigned ReefGate valve and optimised plumbing ensure smooth, balanced, whisper-quiet flow.

Professional Filtration – A large ReefMat-ready sump with adjustable water height, refugium chamber and integrated reservoir gives total flexibility.

Organised Control Hub – The slide-out control panel keeps controllers, cabling, and smart devices neatly managed.

Core Features

• Aluminium Super-Structure

  • Marine-grade frame with built-in levelling system

  • Corrosion-resistant and engineered for long-term durability

• Euro-Brace Reinforcement

  • Structural perimeter bracing for added strength and support

  • Maintains the open-top, rimless aesthetic

• ReefATO+ System (Smart Automation)

  • Dual optical sensors and temperature probe (±0.1 °C)

  • Leak detection with automatic shut-off

  • Full ReefBeat® integration for alerts & control

• Hydrodynamic Plumbing System

  • Optimised return design for increased efficiency

  • ReefGate precision valve for silent downflow control

  • Dual return outlets for even circulation

• Advanced Filtration Sump

  • ReefMat-ready mechanical filtration section

  • Adjustable skimmer chamber & integrated ATO reservoir

  • Spacious layout for reactors or refugium use

• Slide-Out Control Panel

  • Side-mounted pull-out board for easy equipment management

  • Keeps wiring tidy and accessible

• Cabinet & Finish

  • Marine-spec panels supported by aluminium frame

  • Moisture-resistant, soft-close doors & adjustable feet

  • Available in black or white

• Display Glass

  • Bevelled-edge ultra-clear glass (up to 19 mm thick)

  • Deeper and wider display for immersive aquascapes

Technical Specifications

Who is the Reefer S-850 G3 For?

• Reefkeepers running large SPS-dominant or mixed coral systems

• Hobbyists seeking smart automation and rock-solid stability

• Aquarists building a centre-stage display aquarium

• Professionals or enthusiasts who want furniture-grade design

• Anyone seeking a long-term, top-tier reef platform

Warranty & Support

All Red Sea Reefer S-Series systems include a 3-year manufacturer’s warranty, extendable to 5 years upon registration. UK-based support and spare-part availability guarantee peace of mind and long-term reliability.