Hang on back aquarium filters are popular for a reason.

They are compatible with most aquarium styles…

Are very easy to install…

… and occupy no space inside the tank.

If you don’t know which to pick?

Check out the best HOB power filters below!

OUR TOP PICK

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Why We Love it:

  • Patented re-filtration system

  • Poly foam cleaning indicator

  • 5-stage filtration system

Sizes:

Summary:

Fluval C Line is an exceptional HOB power filter designed to maintain refreshing crisp water and provide a stress-free environment for your fish. It creates superior water quality through its extensive 5-stage filtration that combines the benefits of mechanical filtrations with those of the chemical and biological one.

A patented re-filtration system allows controlling the flow rate while maintaining the filtration efficiency intact. This is ideal for delicate fish species, including long-finned goldfish. By filtering more impurities than an average HOB filter, it keeps the water fresher and healthier for longer. Easy to clip on and maintain; it does tend to become a bit noisy over time, but no doubt, this power filter brings true value for money.

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Why We Love it:

  • High filtration volume

  • Ideal for big aquariums

  • Continuous biological filtration

Sizes:

Summary:

The Aquaclear power filter may cost more than the Fluval, but its exceptional features and high filtration volume are truly worth the higher premium. It provides mechanical, chemical, and biological filtration. Its Cycle Guard ensures continuous biological filtration, which improves dramatically the quality of the water.

Water quality is also improved by the re-circulation grid that passes the vital liquid through the filter a second time. Perhaps the only drawback is the mechanical filter that’s not as good as expected. All it takes to get crystal clear water, however, is to replace it with a 100% poly-fil. Despite this small downside, this is still one of the best HOB power filters you can find.

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Why We Love it:

  • Certified high flow rate

  • Bio-Wheel filtration

  • Quick start-up and maintenance

Sizes:

Summary:

Ideal for most aquariums, Marineland Penguin, could be a bit noisier than its competition, but it’s a fantastic HOB power filter to consider. It has a certified flow rate and utilizes two Rite-Size C filter cartridges designed to keep the water clean and healthy.

Super-easy to set up, it’s ideal for both fresh and saltwater systems and delivers an effective three-stage filtration. One of the most praised features is the Bio-Wheel which provides revolutionary biological filtration, removing a higher quantity of toxic ammonia and nitrite than other units. Maintaining and troubleshooting the system is a breeze. Available in various sizes, this is a superb HOB power filter for all tanks.

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Why We Love it:

  • High-volume flow

  • High-volume flow

  • Self-priming system

Sizes:

Summary:

Aqueon QuietFlow might not have a bio-wheel, but that’s exactly why it’s praised by its users. No wheel means fewer moving parts. Thus, longer lifespan. At least in theory; it might not last for a lifetime, but while it works, it does a wonderful job.

Specialty filter pads enhance the efficiency of the three-stage filtration. LED indicator light flashes when it’s time to replace the cartridges, while the internal pump reduces noises. Indeed, the QuietFlow lives up to the expectations, and it’s quieter than many other HOB filters. Another thing we like is the high-volume flow. Backed by a lifetime warranty, it’s a great choice for beginners and experienced hobbyists alike.

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Why We Love it:

  • Revolutionary Bio-Falls quad-filtration

  • Polyfiber floss cartridge

  • Whisper quiet

Sizes:

Summary:

Cascade by Penn Plax is another outstanding hang on back power filter you could get for your tank. It’s perfect for fresh or marine aquariums, providing a clean and healthy environment for your fish to thrive.

A few features that make it different from the other HOB filters out there are the revolutionary Bio-Falls quad-filtration and the internal sponge; the former provides efficient removal of ammonia and nitrite, enhancing oxygenation. The latter optimizes the colonization of beneficial anaerobic bacteria, further improving biological filtration and water quality. Furthermore, an activated carbon filter also removes most pollutants. Ultra-quiet and effective, it’s a great addition to any tank.

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Why We Love it:

  • Patented carbon filter carrier

  • Four models available

  • Easy access door

Sizes:

Summary:

Next entry on our list of the best HOB filters, Tetra Whisper EX, comes in four sizes ideal for smaller or larger tanks. It’s ready to use straight out of the box, and very easy to install and maintain. It boasts innovative Timestrip technology with patented carbon filter carrier designed to keep the water in your tank crystal clear.

An easy-access door on the top of the filter allows an easy change of the cartridge, while the submerged motor requires less maintenance than the external models. Perhaps the only downside is its noise, although taking the pump out and repositioning it might help solve the issue. Despite this slight downside, the filter comes at an exceptional price and could be the best choice for hobbyists on a budget.

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Why We Love it:

  • Self-priming

  • Adjustable flow control

  • Unique slim design

Sizes:

Summary:

As its name suggests, the Slim by Marina is slim. It’s designed to occupy a little space on the back of the aquarium, so you can happily use it even if you don’t have a huge space for your tank.

Besides the slim profile, this HOB power filter also impresses with the efficiency of its dual-stage filtration. Both filters contain Ceramitek, a highly porous ceramic medium developed to optimize biological filtration and maintain the health of your aquarium. Other highlights include the instant starting system, adjustable flow control, and ultra-quiet operation, that make it great for most aquariums and homes.

Your Take

Choosing the best HOB power filter is ultimately up to you.

Do you need a smaller or bigger unit?

With slim or regular design?

Did you find a HOB power filer you like on this list?

Tell me in a comment below; I’d love to hear from you.

And if you know other fish keepers in search of a new filtration system…

… don’t forget to share this article with your friends.