Penn-Plax Cascade 400 110 GPH Submersible Aquarium Filter for Fish Tanks 20 gal.

Aquariums, Ponds, Terrariums, Fountains, or any place where filtration and water movement is needed. Adjustable flow rates and air injection units come with each unit. Internal foam sponge is excellent for Mechanical and Biological filtration. Optional spray bar distributes water evenly over the surface. This unit is excellent for aquariums up to 20 gallons. Filters 110 GPH.