Red Sea REEFER 525 G3 Rimless Reef Aquarium – Black Stand

Red Sea REEFER 525 G3 Aquarium System – Black Stand

The Red Sea REEFER 525 G3 in black gives you a clean, modern 111.7-gallon reef-ready system that looks as good as it performs. It sits within the Red Sea Aquariums family and the REEFER series, and you’ll find it under our main Aquariums collection for easy comparison while planning your next build.

Red Sea REEFER 525 - Clear, Eurobraced Display for Serious Reef Builds

The REEFER 525 G3 uses ultra-clear, beveled-edge glass, so your aquascape looks sharp from every angle. A low-profile black overflow and hidden plumbing keep the display focused on the reef, while the eurobraced top adds both rigidity and a professional finish for long-term, high-flow setups.

• Display Tank Dimensions: 59.1" L x 23.6" W x 21.7" H

• Display Tank Volume: 111.7 gallons

• Total System Volume: 142.7 gallons

Because the tank comes reef-ready out of the box, you can focus on choosing your lights, return pump, and filtration instead of wrestling with plumbing.

Marine-Spec Black Cabinet Built for Daily Use

The REEFER Marine-Spec cabinet in black pairs with the display for a furniture-grade look that still feels practical. Red Sea builds the stand from moisture-resistant plywood, then adds leveling feet and stainless steel hinges so you can adjust the setup and open doors smoothly even after years of use. For the 525 and larger systems, reinforced aluminum supports stiffen the structure, which gives extra confidence when you stock a heavier rock layout or dense coral collection.

Sump Layout Ready for Modern Filtration Gear

Inside the stand, the glass sump offers a straightforward, open layout that makes equipment placement simple. You can run classic filtration or step into automated options without redesigning the system. Many hobbyists pair this aquarium with:

• ReefMat 1200 Fleece Roller Filter

• REEFER DC 600 Protein Skimmer

Because the sump holds about 31 gallons, you gain extra water volume for stability along with space for reactors, additional media, or a refugium if you want to grow into a more advanced filtration setup later.

Pre-Assembled Plumbing with ReefGate Fine-Tuning

REEFER G3 systems arrive with pre-glued plumbing, so you assemble the drain and return without cutting or cementing PVC. The updated layout reduces unnecessary 90-degree turns, which encourages smoother flow and quieter operation. In addition, the ReefGate flow valve lets you fine-tune the main drain quickly, so you can dial in a quiet, stable full-siphon without constant adjustment.

ReefATO+ for Top Off, Temperature, and Leak Protection

Every REEFER 525 G3 includes the ReefATO+, which combines three important safeguards into one connected package:

• Automatic Top Off: The primary optical sensors maintain a consistent water level, while a backup sensor 1" higher shuts the pump down if the level rises too far. You see real-time water level status through the ReefBeat app.

• Temperature Monitoring: A built-in, pre-calibrated temperature probe reads with ±0.1° accuracy. If temperature drifts outside your chosen range, the app sends an alert so you can react quickly.

• Leak Detection: A sensitive Reef-Spec leak detector with titanium probes can detect both saltwater and RO/DI water. When it detects moisture, the system immediately disables the ATO pump and, after re-checking, triggers optional audible and app-based alerts.

Because these features work together, the system helps you hold salinity, temperature, and safety within tight limits day after day.

Technical Specifications – REEFER 525 G3 (Black)

• Display Tank Dimensions: 59.1" L x 23.6" W x 21.7" H

• Total System Height: 55.9"

• Display Tank Volume: 111.7 gallons

• Total System Volume: 142.7 gallons

• Sump Volume: 31 gallons

• Glass Thickness: 0.59"

• ReefATO+ Pump Power Consumption: 6–10 watts

• ReefATO+ Pump Max Flow Rate: 75 GPH

• ReefATO+ Pump Max Head: 8 feet

Note: The included ReefATO+ Auto Top Off System does not support freshwater-only setups.

What You Get with the REEFER 525 G3 – Black

• REEFER 525 G3 Aquarium

• Marine-Spec Black Cabinet

• Glass sump with pre-glued plumbing

• ReefATO+ Auto Top Off System

• 5-Year Manufacturer Warranty (3 years standard + 2 years upon registration)