Hang-On Filters

Shop Hang-on filters for your Aquariums

Hang-on filters are a type of external aquarium filter. Like the name suggests, they are hung or clipped on the aquarium with a clip or bracket. While they typically do the same work as the other filters, hang-on filters are popular among aquarists because they are easy to install and maintain, and do not have to interfere with the aquascape since they are outside the aquarium. The device draws water from the aquarium, filters and purifies it, and then pumps it back into the aquarium. The HOB filter carries out the mechanical, chemical, and biological filtration, removing the solid waste, the dissolved waste and chemicals, and converting harmful ammonia and nitrite to a less toxic nitrate. It then returns cleaner, clearer, and balanced water for the fish and plants, back into the aquarium.

Also referred to as hang-on-back (HOB) filters, they carry out the same three stages of filtration as is done in other filters. There are basic hang-on filters that carry out the three stages of filtration, and there are multi-function HOB filters that allow the aquarist to adjust flow rates and come with specialized outlets to enhance water circulation. There are also large hang-on-back filters that come with more filter media and can work for large aquariums. Some advanced hang-on filters come with larger filter chambers, giving them the appearance of a small cannister filter. While they all perform similar functions, there are specifications you should look out for before choosing one for your fish tank.

Other things to look out for when choosing a HOB filter include the tank size (each type comes with volume specifications), what features you want (basic or advanced), and how much time you want to invest in maintenance. All hang-on filters are easy to clean and replace filter media, but some are easier than others. For many types, you don’t have to disassemble the entire device just to change one part. In terms of your filtration needs and the number of inhabitants, check the filter media to customize it for your aquarium. Also consider the kind of fish in your aquarium when buying. More delicate fish may not be comfortable with a HOB filter that gives stronger water currents.

The water-fall effect, which occurs when the water is being released into the aquarium, may be considered noisy by some aquarists. But it is still a reason others choose it, because the waterfall effect helps the oxygenation of the water. You can reduce the noise level by adjusting the flow rate if the noise gets to you, or shop for quiet filters like AquaEL Filter FZN PRO, 400, where the motor is placed under the water to insulate the sound. A major mistake to avoid is picking a small filter for your aquarium, which can lead to inadequate filtration and affect your fish’s health. Also, avoid going too long without cleaning your filter. Be careful to also choose the right flow rate for your fish, as too low a flow rate can result in inadequate filtration, and too high a flow rate can stress your fish.

If you are looking for a type of filter that is easy to set up, easier to maintain, and occupies little or no space, then you want to get a hang-on filter. The parts are also easy to replace, and no matter the size of the tank you have, there is bound to be one that works for you. Explore our collection of hang-on filters, and you will find just the right one for your aquarium.

FAQs About Hang-on Filters

(1) Why should I choose a hang-on filter instead of the other filters?

Hang-on filters are the most popular because they are affordable, available, efficient, easy to install, and maintain. They do mechanical filtration using the pre-filter sponge or mesh, biological filtration using bio-wheels or ceramic rings, and chemical filtration using activated carbon or zeolite.

(2) What is the first thing to do after setting up my hang-on filter?

Once you install it following the instructions in the manual, prime it up by running it for a few minutes outside the tank of water to get rid of all the air bubbles. Then fix it on your aquarium and adjust the media to fit the filtration needs of your tank.

(3) How to maintain hang-on back filters?

It is quite easy to maintain, and all you need to do is clean the filter media to avoid clogging. You should also rinse the biological media and replace the mechanical media following the manufacturer’s instructions. Better still, have a maintenance schedule that you follow to keep the filter in optimal condition.

(4) How do I clean the hang-on filter?

To clean your hang-on filter, you will need a soft brush to scrub the small parts. Also, clean the impeller, the intake tubes, and other parts. For the sponges and biological media, rinsing them in a bucket of tank water is sufficient to get them clean.

(5) Do I need to use an air pump with the hang-on filter?

No, it is not necessary. The water returned into the aquarium introduces sufficient oxygen as it is pumped back in. The water vibrations also allow for sufficient gas exchange, making an air pump a luxury you can ignore.