Reef Octopus Classic 100 HOB Protein Skimmer – Up to 105 Gallons

The Reef Octopus Classic 100 HOB Protein Skimmer is a hang-on-back (HOB) skimmer designed for marine aquariums up to approximately 105 Gallons. It features a durable acrylic body, a low-profile footprint of 8″ × 3.75″ and a total height of 17″. Powered by the Aquatrance 1000s pinwheel pump drawing around 9 W, it is built for efficient foam fractionation and quiet operation. With its easy install design — simply hang it on the back of your aquarium, mount the pump inside, and adjust the intake strainer — it provides professional performance without requiring a sump.

Why You’ll Love It:

• Hang-on-back design — no sump needed, ideal for tanks where space is limited

• Efficient Aquatrance 1000s pump for minimal noise and strong performance

• Durable acrylic construction with clear collection cup for monitoring

• Up to 105 Gallon rated capacity — suited for mid-sized marine systems

• Simple installation and maintenance, built for reef and marine use