Professional External Protein Skimming for Large Reef Aquariums

The Octo Regal 300EXT Recirculating Protein Skimmer is engineered for advanced reef aquariums where maximum nutrient export, precise control, and exceptional performance are essential. Designed for external installation, the Regal 300EXT is ideal for large reef systems, custom filtration rooms, and dedicated fish rooms, delivering powerful protein skimming for aquariums up to 700 gallons.

At the heart of the Regal 300EXT is the VarioS-6S controllable DC recirculating pump, providing adjustable performance through five power levels while maintaining whisper-quiet operation and excellent energy efficiency. The hybrid conical reaction chamber naturally stabilizes foam production, maximizing contact time between air and water to remove dissolved organic compounds before they become nitrate and phosphate.

Unlike traditional in-sump skimmers, the Regal 300EXT is designed as an external recirculating skimmer, allowing for greater installation flexibility and improved control over water flow. Simply pair it with a dedicated feed pump, and you'll have one of Reef Octopus' most capable commercial-grade filtration systems.

Features

• External recirculating protein skimmer
• Rated for aquariums up to 700 gallons
• Premium hybrid conical reaction chamber
• High-performance VarioS-6S Controllable DC Pump
• Five adjustable speed settings
• Energy-efficient 36V DC operation
• Soft-start technology extends pump life
• Quiet operation with oversized air silencer
• Fully disassembles for easy maintenance
• Precision gate valve adjustment
• Heavy-duty cast acrylic construction
• Controller compatible through 0–10V input
• Professional-grade filtration for large reef systems

Recommended Aquarium Size

• Light Bioload: Up to 700 Gallons
• Medium Bioload: Up to 600 Gallons
• Heavy Bioload: Up to 500 Gallons

Specifications

Skimmer

• Footprint: 20" × 17.5"
• Body Diameter: 12"
• Neck Diameter: 7"
• Height: 25.6"
• Output Size: 1.5" (50mm)
• Output Height: 9.56"

Pump

• Reef Octopus VarioS-6S DC Recirculating Pump
• Adjustable Power Consumption: 35–70 Watts
• Voltage: 36V DC
• Maximum Water Draw: 740 GPH
• Air Draw: 1,200–2,000 LPH
• Five controllable speed settings
• Waterproof controller connection
• Soft-start technology
• Rotating pump volute for flexible plumbing

Important Installation Information

The Octo Regal 300EXT is an external recirculating skimmer and requires a separate feed pump.

Recommended Feed Pump Flow: 1,200–1,600 GPH (approximately 1.5–2x total system volume).

Why Choose the Octo Regal 300EXT?

Designed for serious reef keepers, the Regal 300EXT delivers commercial-level protein skimming performance while providing the flexibility of an external recirculating design. The controllable DC pump allows precise tuning for changing bioloads, while the hybrid cone body creates an incredibly stable foam head for maximum organic waste removal.

Whether you're maintaining a large SPS reef, a heavily stocked fish-only system, or a custom-built aquarium, the Regal 300EXT provides the power and reliability needed to maintain pristine water quality.

What's Included

• Octo Regal 300EXT Protein Skimmer
• VarioS-6S DC Recirculating Pump
• Digital Pump Controller
• Collection Cup
• Air Silencer
• Power Supply
• Plumbing Connections
• User Manual

Why Shop with Infinity and Beyond Aquatics?

At Infinity and Beyond Aquatics, we're hobbyists first and aquarium retailers second. We carefully select premium equipment from trusted manufacturers so you can build your reef with confidence.

When you shop with us, you'll enjoy:

• Authorized dealer for leading aquarium brands
• Competitive pricing on premium reef equipment
• Fast, reliable order processing
• Secure packaging to protect your investment
• Friendly customer support from experienced aquarists
• A growing selection of freshwater, saltwater, and reef aquarium products

Whether you're upgrading an established reef or building your dream aquarium from the ground up, we're committed to providing quality products, dependable service, and expert support every step of the way.