Going With the Flow—or Against the Current? Aquarium Filtration 101
A smaller hang-on-back aquarium filter is a great choice for nano tanks
Larger canister filters provide flexible, customizable flow options and a cleaner aesthetic for all aquariums
Why is better flow and circulation important?
Aquario Inflow and Outflow pipes positioned in the most optimal corner of aquarium for efficient flow. Notice the water ripples that provide visual indication of full circulation.
Accessorized Aquario Neo Flow outflow to create gentler flow for Betta Fish
A canister filter can be used on even smaller nano aquariums. This one is a 6 gallon tank equipped with an Ultum Nature Systems Delta 30.
Other benefits of getting a large aquarium filter

A 2 gallon cube aquarium with an HOB filter

A smaller 1 gallon cube shrimp tank with a canister filter

Two HOB filters to create a complete circular flow in a shallow aquarium, but the greatest visually.

A similar sized aquarium with a cleaner look and stronger flow from a canister filter