There are many filter types for 20 gallon fish tanks such as power, canister, internal filters; they are the most modern and powerful ones today. In this review, I will provide you the best filters for 20 gallon aquarium that help you easily find your best one.

If you are a beginner, you should acquire some knowledge about types of aquarium filters to easily understand this filter review.

The best power filters for 20 gallon aquarium

As you know, canister filters are designed and are the best filter type for the larger tank that usually have a size more than 20 gallons. Although, there are some canister filters for small tank as 20 gallon tank, they usually come with the price too high compared to other filter types. So, choosing a power filter (also called as HOB filter) is just enough power to purify a tank with 20 gallons of water.

Power filters usually provide all 3 types of filtration (mechanical, biological and chemical) that really make your water clean and clear, and provide your fish the very good habitat for their health.

AquaClear 20 Power Filter

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AquaClear 20 Power Filter is the very popular and powerful power filter in the market and its quality is proven by thousands of aquarists on the world. The filter has a larger capacity compared to other filters in the same type that provide the maximum capture of waste in the aquarium.

The filter features:

The filter comes with some filter materials such as AquaClear Foam, Activated Carbon, BioMax and Cycle Guard that are necessary for you to complete the installation. With the filtration grid, you know that all the water in the tank goes through the filter and is safe for your fish.

What make it the most favourite filter of many aquarists is its customization because of the larger capacity. You can use alternative filter materials for the filter to work without having to use the cartridges same to the product’s one. People love to use the filter with only 2 filtration (biological and mechanical) and they only add Activated Carbon media to perform the chemical filtration when they see the aquarium water looks yellowish.

With its very affordable price, quality and customization, the filter is recommended for the creative aquarists who want to build their own filters.

Fluval C2 Power Filter

This power filter is very similar to the first power filter. It is manufactured by Hagen Fluval, a well-known brand by their powerful product line, Fluval 06 series canister filters for aquariums up to 100 gallons.

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The filter features:

The filter includes everything you need such as the activated carbon for chemical filtration, the C-nodes needed to have colonies of bacteria beneficial to the fish, and the foam blocks to mechanically filter the waste.

This is a very quality product similar to the previous, so if you are a fan of Fluval filter line, this filter is produced for you. I’m not a fan of them, I like Marina’s products.

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Marina Slim S20 Power Filter

I like Marina because their quality aquarium kits such as 20 gallon aquarium kit, 10 aquarium gallon kit. Most of their products are absolutely quality and they satisfy any hobbyist from the new to advanced. You can easily find that when you read the reviews of Marina’s products on

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The abundance of biological filter materials (zeolite and Ceramitek) included in the cartridges of the filter ensures that the harmful toxic nitrate and nitrite are degraded and no longer threaten your aquarium lives.

The filter features:

Not hesitatingly, it is surely the best power filter as well as the best filter for a 20 gallon tank in this review. If you are a fan of Marina like me, you surely buy this product without any hesitation.

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The best canister filters for 20 gallon aquarium

The design is such that the canister filters are divided into different baskets so you can adjust the types and proportion of the filter materials as you see fit. Because canister filter is an external filter, its capacity is much bigger than any other types of filters that give it the advantage of containing huge amount of filter material as well as maximum filtration.

Most aquarists prefer to filter their tanks with canister filters today despite that they usually come with the fairly expensive prices. The filters are common designed for the larger tank, however, there are a few for the small tank.

Fluval 106 External Filter (canister filter)

Fluval is well-known brand with their canister filter products for many different tank sizes from small 20 gallon to extra large ones used for ponds. These are the most advanced filters on the market for aquariums. They have much filter capacity and provide for additional biological filtration.

Fluval 106 canister filter is one of the filter in 06 series from Fluval used for aquariums up to 25 gallons and certainly it is a great canister filter for your 20 gallon aquarium.

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The filter features:

The filter also come with multiple filtration baskets that are already packed with the necessary filter materials for mechanical, chemical, and biological filtration.

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Read full review of Fluval 106 canister filter here:

Finnex PX-360 Compact Canister Aquarium Filter

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The filter features:

The filter come with multiple removable filtration chambers to add or remove any media you choose. It also come with filter medias such as activated carbon floss pad, sponge and ceramic rings.

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The best internal filters for 20 gallon aquarium

Whisper® Internal Aquarium Power Filters

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The filter features:

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Tips for choosing the best filter for your tank

In the wild, the wastes are naturally diluted in the water, but in an aquarium without a filter, they can build up as toxic waste and become deadly to the fish. The waste products include ammonia that is lethal to the fish.

The more fish you have in the aquarium, the more waste you have accumulating. A small aquarium with a lot of fish that get fed a lot will have a lot more waste build up than a tank with a few fish that are not fed a lot of food. Although changing the water on a regular basis does help, but it is time consuming. An easier way of making sure that the water in your aquarium is safe is to use a filter.

The ammonia in the tack comes from the gills of the fish as well as from the decaying waste and food. If you have a filter that can filter this ammonia and waste from the water, you avoid the nasty build up. Not only are they dangerous for the fish, but they are also ugly and take away from the beauty of your aquarium.

The four most popular filters are those that use sponges, paper cartridges and loose and bonded floss media. The paper cartridges have the largest openings and the bonded floss has the smallest openings. A filter with small openings catches all the fine particles that you might not be able to see. However, it also clogs faster because of the number of larger particles that it sucks up.

A larger filter will not require as much maintenance because it doesn’t get clogged as often. When looking at a filter, you also have to look at the biological and chemical filtration abilities. The more chemical and biological filtration the filter does, the more healthy your aquarium fish are.

Hope this review helpful for you.

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