Red Sea REEFER 425 Aquarium System G3 in Black

SiREEFER 425 G3 Aquarium System for Modern Reefkeepers

The REEFER 425 G3 delivers a clean, modern approach to reefkeeping with a display that balances clarity, stability, and layout flexibility. Built by Red Sea Aquariums and refined through years of engineering, this model offers a solid foundation for long-term reef systems. As part of the REEFER series, it gives hobbyists the freedom to pair their preferred lighting, filtration, and controllers while still enjoying a thoughtfully designed, plug-and-play-ready framework within the larger Aquariums category.

Ultra-Clear Display With a Minimalist Overflow

The REEFER 425 G3 uses low-iron, beveled-edge glass to keep colors accurate and viewing distortion minimal. The reinforced eurobracing adds support without taking away from the open-top look, and the slim overflow box keeps plumbing discreet. The footprint offers enough depth for creative aquascaping, whether you prefer a mixed reef, SPS-dominant layout, or a more relaxed, soft coral build.

Marine-Spec Cabinet Built for Everyday Use

The cabinet is constructed from marine-spec laminated plywood with moisture-resistant finishes and corrosion-resistant hardware. Leveling feet help you dial in a stable base, while the clean lines and modern profile make the system look intentional in any living space. Available in both black and white, the stand lets you match your existing décor while still meeting the demands of a saltwater environment.

Sump Layout Ready for ReefMat and REEFER DC Skimmers

Beneath the display, the glass sump is laid out for straightforward access and upgrade flexibility. Its design makes it easy to integrate a variety of filtration options, including fleece rollers, protein skimmers, media reactors, or refugium sections.

Popular Red Sea pairings include:

• ReefMat 500 fleece roller filter

• REEFER DC 600 protein skimmer

The open layout makes it simple to adjust equipment as your reef matures or your filtration strategy evolves.

Plug-and-Play Plumbing With ReefGate Flow Control

Every REEFER G3 system ships with pre-assembled plumbing, so you don’t have to cut or glue pipes. The updated G3 layout reduces unnecessary turns to help maintain strong flow from your return pump. The ReefGate flow valve allows you to fine-tune your drain for quieter operation, helping you keep the system running smoothly with minimal trial and error.

ReefATO+ Included for Top-Off, Temperature, and Leak Monitoring

Each REEFER 425 G3 includes the ReefATO+, combining several key safeguards into one compact package:

• Automatic top-off control with a backup sensor positioned above the primary level

• Temperature monitoring with tight accuracy to keep heater performance in check

• Leak detection using saltwater-safe titanium probes for added peace of mind

• Integration with the ReefBeat app for notifications and status checks

This combination helps stabilize salinity, provides basic thermal oversight, and adds an extra layer of safety around your stand and sump area.

What You Get With the REEFER 425 G3

• REEFER 425 G3 glass aquarium

• Marine-spec cabinet in your selected finish

• Glass sump with included plumbing

• ReefATO+ auto top-off and monitoring system

• 5-year manufacturer warranty when registered (3 years standard plus 2 additional years upon registration)

Long-Term Support and Warranty

Red Sea backs the REEFER 425 G3 with a multi-year warranty when the system is registered, offering coverage for structural and material defects. That support, combined with the flexible design of the REEFER series, makes this system a strong choice for reefkeepers planning a long-term build.

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