Penn-Plax Cascade 600 Fully Submersible Internal Filter – Provides Physical, Biological, and Chemical Filtration for Aquariums and Turtle TanksBrand: Penn Plax Color: Tan Features: QUIET & EFFICIENT: The Cascade 600 Submersible Filter quietly delivers crystal clear water throughout the aquarium. This filter cycles water at 175 Gallons per Hour (GPH) for tanks up to 50 Gallons in size. Its great for Freshwater and Saltwater aquariums, along with a variety of Terrarium setups. ACCOMMODATING: The adjustable flow switch allows for increased or decreased water flow at will, which is extremely