JBJ Reaction HOB Aquarium Filter & Media Reactor – Hang On Back Filtration System for Freshwater & Saltwater Tanks – Multiple Sizes (Up to 50 Gallons)

The JBJ Reaction HOB Aquarium Filter & Media Reactor is a versatile hang-on-back filtration system designed for aquarists who want more control over their aquarium setup without adding bulky equipment inside the tank. By combining the simplicity of a traditional HOB (hang-on-back) filter with the flexibility of a media reactor-style system, this unit allows you to customize your filtration using a wide range of media. Whether you are running mechanical filtration with sponge, chemical filtration with carbon or resins, or adding biological media, the Reaction series is built to adapt to your setup. The configurable intake system includes interchangeable components, allowing you to choose between a standard intake or an optional surface skimmer attachment. This flexibility gives you the ability to target surface film and floating debris or focus on traditional water column filtration depending on your aquarium’s needs. Water is drawn through a multi-stage filtration process and returned to the aquarium in a waterfall-style flow, helping promote circulation and gas exchange. The adjustable flow control makes it easy to fine-tune water movement for nano tanks, planted aquariums, shrimp tanks, and larger community systems. Designed to mount cleanly on the back of your aquarium, the JBJ Reaction HOB Filter keeps equipment out of sight while maintaining a streamlined and professional look. Its compact footprint and straightforward setup make it suitable for both beginner and experienced aquarists. Available in multiple sizes to support a wide range of aquarium capacities, the JBJ Reaction series delivers a flexible and space-saving filtration solution for freshwater and saltwater environments.

• COMPACT HANG-ON-BACK (HOB) AQUARIUM FILTER DESIGN: Mounts directly to the back of your aquarium, keeping filtration equipment out of sight while maintaining a clean and uncluttered aquascape for freshwater and saltwater tanks.
• DUAL INTAKE SYSTEM WITH OPTIONAL SURFACE SKIMMER: Configurable intake includes interchangeable components that allow you to run a standard intake or attach the surface skimmer to help remove surface film and floating debris.
• MULTI-STAGE FILTRATION WITH MEDIA REACTOR FLEXIBILITY: Supports mechanical, biological, and chemical filtration using sponge, carbon, resins, and bio media, allowing you to customize your filtration setup to match your aquarium needs.
• WATERFALL RETURN FLOW FOR CIRCULATION AND GAS EXCHANGE: Designed with a cascading return that promotes steady water movement and oxygen exchange throughout the aquarium.
• ADJUSTABLE FLOW CONTROL FOR DIFFERENT AQUARIUM SETUPS: Easily fine-tune water flow to suit nano tanks, shrimp tanks, planted aquariums, or larger community systems.
• QUIET OPERATION WITH STABLE HANG-ON INSTALLATION: Engineered for smooth and quiet performance with a leveling system that helps maintain proper positioning on a variety of aquarium sizes.