Fluval AquaClear 50 Power Filter – A versatile hang-on-back filter for aquariums up to 50 gallons, known for its superior multi-stage filtration. It has a large media basket that allows mechanical foam, activated carbon, and BioMax rings to work in sequence, removing debris and toxins while cultivating beneficial bacteria. The AquaClear 50 offers adjustable flow and quiet operation, keeping aquarium water clean, clear, and healthy for fish.