Reef Octopus BioChurn 90ext HOB Reactor

Reef Octopus BioChurn 90ext HOB Reactor for Hang-on-Back Nutrient Control

The Reef Octopus BioChurn 90EXT HOB Reactor delivers controlled biopellet fluidization for reef aquariums up to 100 gallons. Created by Reef Octopus, this external hang-on-back system keeps pellet suspension consistent without overwhelming smaller tanks. As nutrient levels rise from regular feeding, steady media motion becomes essential. Therefore, balanced churn flow supports reliable nitrate and phosphate reduction.

BioChurn 90EXT HOB Reactor Built for External Flexibility

Unlike traditional in-sump Reactors, the 90EXT mounts conveniently on the back of the aquarium or sump. This configuration works well when internal sump space remains limited. The compact 8.7 inch by 4.53 inch footprint and 4 inch body diameter keep the system manageable. Meanwhile, the 16.15 inch height supports proper internal circulation.

The included Aquatrance AQ-800 pump feeds the reactor while maintaining consistent pellet suspension. Because the pump integrates directly with the chamber, installation stays straightforward.

Controlled Cyclone Motion in the BioChurn 90EXT HOB Reactor

The patent-pending churn plate creates a controlled cyclone-style flow pattern inside the chamber. Instead of blasting pellets with harsh pressure, the system keeps media evenly suspended. As a result, bacteria colonize efficiently across the pellet surface.

The cascading internal design increases surface contact between nutrient-rich water and biopellet media. Consequently, nutrient export remains steady even in compact reef systems.

BioChurn 90EXT HOB Reactor Specifications

• Rated for aquariums up to 100 gallons

• Holds up to 400 milliliters of biopellet media

• Dimensions: 8.7 inches x 4.53 inches

• Body diameter: 4 inches

• Height: 16.15 inches

• Feed pump: Aquatrance AQ-800

Because hang-on systems reduce sump dependency, this model supports flexible placement in reef setups with limited interior space.