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
Shipping Information
Large Shipping – $45.99 Flat Rate
Due to the size and weight of this protein skimmer, it ships using our Large Shipping service.
Large Shipping: $45.99 flat rate
Processing Time: 1–3 Business Days
Estimated Delivery: 5–8 Business Days
Carefully packaged to protect all acrylic components during transit
Tracking information will be emailed once your order ships
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.
