Hygger Aquarium HOB Filter 315 GPH | External Hang-On Back Filter for 40-75 Gallon Tanks

Meet the Hygger Aquarium HOB Filter 315 GPH, a reliable external filtration solution designed for 40-75 gallon tanks. Its hang-on-back design keeps the tank uncluttered while delivering steady water movement that helps keep debris suspended and water looking clear. The soft, rhythmic trickle of water returning to the aquarium creates a calming ambience while supporting healthy circulation for a wide range of aquariums.

Efficient filtration with adjustable flow

The filter creates a gentle cascade, forming a micro waterfall that enhances surface agitation and oxygen exchange without a loud pump hum. The top knob lets you dial in the exact flow your setup needs, while the extendable intake tube adapts to different depths, so you can tailor it to your tank and inhabitants.

• External mounting saves valuable tank space and reduces disturbance during maintenance
• Extendable intake tube matches tank depth for flexible setup
• Sponge-inlet helps prevent small inhabitants from being drawn in
• Indicator light reminds you when to replace filter pads

Two media options for cleaner water

Change or add media as needed. The dual-media cartridge combines a dual-sided sponge cotton with ultra-activated carbon to capture waste, odors, and discoloration, while the bio-filter plate provides a larger surface area for beneficial biofiltration. This combination supports both quick improvements in water clarity and longer-term biological stability.

• Filter cartridge with sponge cotton and activated carbon for odor and color control
• Bio-filter plate increases surface area for bio filtration and microbial growth

Smart design for beginners and seasoned hobbyists

Maintenance is straightforward: the filter is designed for easy external service, and replacement media is simple to add or swap. The compact form, adjustable flow, and reliable filtration make it a practical choice for evolving setups without overpowering delicate inhabitants.

Real-world use cases

In mixed communities or planted tanks, the adjustable flow helps tailor currents to different species, while the gentle waterfall return reduces stress for shy fish and fry. Quiet operation and a space-saving profile make it easy to integrate into existing aquariums and furniture setups.