Hagen Marina S20 Compact and Slim Hang-On Aquarium Power Filter - Up to 20 Gallons

Marina Slim Power Filter S20 – A hang-on-back aquarium filter designed for tanks up to 20 gallons. Like other Marina Slim filters, the S20 has a narrow profile that doesn’t protrude far from the tank, saving space. It provides effective 3-stage filtration: the cartridge floss and activated carbon remove waste particles and impurities, while the biological ceramic inside supports good bacteria. The filter’s flow rate can be adjusted, which is useful for feeding or for fish that need calmer water. It’s a user-friendly filter that keeps medium-sized aquariums clean and fish thriving.