Best 20 Gallon Tank Aquarium Filters of 2026

The Aqueon QuietFlow Power Filter is a high-quality filter designed specifically for aquariums up to 30 gallons. It features a dense floss that effectively removes particles and debris, ensuring cleaner water for your fish. The activated carbon component eliminates toxins, odors, and discoloration, creating a healthier environment for your aquatic pets. Additionally, the patented bio-holster removes toxic ammonia and nitrites, further enhancing the water quality. The diffuser grid not only removes additional toxins but also adds oxygen, promoting the activity of your fish. With its reduced splashing, the Aqueon QuietFlow Power Filter ensures an exceptionally quiet return. Experience the convenience and benefits of this powerful filter for your aquarium.

The Tetra Whisper In-Tank Filter 40i is an all-in-one air pump and water filter system that mounts on the inside of your aquarium with clip (included). It features a dense, dual-sided mesh filter that catches debris and fish waste, while aerating the water up to 170 GPH. It also uses large, easy to change Bio-Bag cartridges, making it possible to place tank flush against the wall.

The Aqueon QuietFlow 10 LED PRO Aquarium Fish Tank Power Filter is a great choice for up to 20 gallon aquariums. It features an LED indicator light that flashes when water cannot pass through the cartridge, a self-priming filter pump that will auto-start or restart if power is interrupted, and provides mechanical, chemical, and biological filtration. Customers love the new design of the filter, where the motor is inside the tank, and appreciate the high flow rates for optimal oxygen content. The filter is also easy to clean and maintain.

The Pawfly 80 GPH Aquarium Filter is designed to keep your 10 to 20-gallon fish tank clean and healthy. Its fine sponge filter efficiently traps debris and supports biological filtration, so you won’t have to worry about shrimp or fry getting sucked in. The adjustable 80 GPH water pump offers two outlet options, allowing you to control water flow and improve circulation, which helps maintain fresh water. Additionally, the filter comes with clear airline tubing that produces bubbles, boosting oxygen levels in the tank to create a lively environment for your aquatic pets. This filter is a convenient and effective way to ensure your tank stays clear and well-oxygenated.

The NICREW Aquarium Internal Filter is a submersible power filter with multiple functions, designed to provide effective and thorough biological and chemical filtration for aquariums 10-20 gallons in size. It comes with adjustable air regulator, four suction cups for secure in-tank installation, and is suitable for both freshwater and saltwater tanks. It is also equipped with activated carbon and fine filter foam to trap debris and fish waste, absorb odors, and generate abundant air bubbles and water flow.

The hygger HOB Filter offers a convenient way to keep your aquarium clean and healthy. Its indicator light alerts you when the filter cartridge is clogged, so you know exactly when it’s time to replace the pads, saving you guesswork. Designed to hang on the outside of your tank, it saves valuable space inside and lets you clean the filter without disturbing your fish. The filtered water flows back into the tank as a gentle waterfall, which helps increase oxygen levels and keeps the water moving. Plus, you can easily adjust the water flow and extend the intake tube to fit your tank’s depth, giving you full control over your aquarium’s environment.

The AQQA Quiet Aquarium Filter is designed for easy and quick setup, allowing you to plug it in and start filtering immediately without the hassle of pre-filling with water. You can easily adjust the water flow to suit different types of fish, whether they prefer gentle currents or more active water movement, giving you control over your tank's environment. Its triple bio sponge system with activated carbon ensures your tank stays clean by efficiently removing debris and harmful substances. Plus, this filter operates almost silently, so it won’t disturb you or your aquatic pets, making it ideal for quiet spaces like bedrooms or offices.

The FEDOUR Submersible Aquarium Internal Filter is a powerful filter that is suitable for 1-20 gallon fish tanks. It has excellent filtration performance, can absorb and get rid of grease and other dirt to clean water, and can provide oxygen for your fish tank. It is easy to install and comes with adjustable water flow. However, the flow adjuster may not work and the filter may stop working when the water line gets lower than the spray bar.

The TARARIUM Turtle Tank Filter offers a 4-stage bio-filtration system that effectively traps debris and fish waste, helping you keep your tank water clean and clear. Its dual-sided mesh filters, combined with activated carbon and bio balls, reduce odors and discoloration, so your aquatic environment stays healthy. Installation is simple with two options: hang it on the tank or use strong suction cups, making it adaptable to different water levels and tank setups. Plus, its quiet motor runs underwater, allowing you to enjoy a peaceful environment while the waterfall design increases oxygen in the water, benefiting your turtles, fish, or amphibians.