The Aqua One Clearview Hang on Filter offers a far superior level of both mechanical and biological filtration. The superior motor design provides silent and energy efficient operation plus a modular design which allows for a variety of media. Clip on design Ideal for any aquarium Agile and won't take up much space Superior filtration Modular design Suitability: Freshwater Tropical & Marine aquariums Sizes: 100, 200, 300, 500, 800