Octo Classic 90 HOB Protein Skimmer

Reef Octopus Classic 90-HOB Protein Skimmer

The Reef Octopus Classic 90-HOB (SKU: CLSC-90HOB) takes a completely fresh approach to hang-on-back filtration. While standard HOB skimmers rely on boxy, rectangular chambers that can cause performance-robbing water turbulence, the Classic 90-HOB features a true cylindrical 4-inch reaction chamber. This architectural design, combined with a smooth conical body-to-neck transition, handles the air-and-water mixture incredibly gently. The result is a highly stable, uniform foam column that efficiently strips dissolved organic compounds out of aquariums up to 130 gallons without ever requiring a sump.

Driven by the ultra-efficient Aquatrance 1000s pinwheel pump, this skimmer is uniquely configured with the motor hanging externally beneath the main acrylic body. This layout ensures a remarkably slim profile that requires minimal clearance behind your aquarium glass. Additionally, the intake plumbing features a built-in surface skimmer box. By constantly drawing water directly from the surface line, it strips away the protein-heavy oil film that naturally accumulates and blocks light. With its robust cast acrylic construction, quiet air silencer, and easy-to-empty collection cup, the Classic 90-HOB delivers pristine water quality to standalone marine systems.

Key Features

• Turbulence-Reducing Cylinder: Circular design allows microbubbles to rise smoothly without colliding or popping prematurely.

• Aquatrance 1000s Pump: Pulls 420 L/H of air while consuming an energy-saving 9 Watts of power.

• Integrated Surface Degreaser: Keeps the top of your water column pristine, maximizing gas exchange and PAR penetration.

• Precision Control Output: A fine-tuned gate valve mechanism allows you to dictate exactly where the water line rests inside the body.

• Sump-Free Adaptability: The perfect elite filtration upgrade for standard, standalone rimmed or rimless saltwater aquariums.

Bioload Handling

• Heavy Bioload: 60 Gallons

• Medium Bioload: 80 Gallons

• Light Bioload: 130 Gallons

Online exclusive: this item is ordered in for you and is usually ready within a few business days. Choose in-store pickup, local delivery or shipping at checkout.