Aquanook Nano Betta Tank Filter

A low-flow internal filter built for nano tanks, with an adjustable output that will not toss a betta around. Quiet enough to sit on a desk beside you. • Adjustable flow so long-finned fish are not buffeted • Replaceable media cartridge with a sponge pre-filter • Suction mounts fit the corner of a small tank It is sized for small water volumes, so match it to your tank rather than buying oversized. Rinse the sponge in tank water during changes to keep the bacteria you want. Check the listed tank range and dimensions before ordering.