Extremely versatile and customisable, the Protégé P4000 External Aquarium Filter and Pump series hold large amounts of mechanical, chemical, and biological filter material in varying combinations to provide you with the ultimate filtration. The result is maximum flexibility to create a unique filtration system suited for your needs. The Protégé Ultra Series delivers a smooth consistent flow of water to pass through the filtration system. It provides the water flow that is vital for effectively distributing oxygen to fishes and other aquarium inhabitants. Aside from aeration and water circulation, the pump can also operate ornaments and create currents inside the tank.