Marina Slim Power Filter S10 – A slim hang-on-back filter for small aquariums up to 10 gallons. This filter has a sleek design that takes up minimal space behind the tank, and it uses quick-change cartridges that combine mechanical and chemical filtration (filter floss with activated carbon) to keep water clear. It also features a small bio media grid for biological filtration. The S10 runs quietly and has an adjustable flow rate if you need to reduce the current for bettas or delicate fish. It’s easy to set up and maintain – an excellent filtration solution for nano tanks or quarantine aquariums.