Betta Fish Tank Internal Filter 150L/h Aquariums up to 25L The Betta aquarium internal filter range is perfect for small aquariums and combines a functional design with mechanical filtration. Fully submersible, the filter is easy to maintain with easy access to the foam filter media for cleaning. Supplied with a venturi outlet and spray bar to create bubbles and increase oxygen level of returning water promoting improved fish health. Fully submersible aquarium filter Foam sponge filter media cartridge included Venturi and spray bar included Easy installation, operation and maintenance