The BioCube Circulation Pump simulates natural river and reef currents by continuously circulating water throughout the aquarium. With a 250 gallon per hour flow rating the BioCube Circulation Pump makes a great addition to any nano reef aquarium. Fits all sizes of biocubes, as well as aquariums 30 gallons and under. An Easy-lock suction cup makes installation, adjustments, and removal a snap, and convenient cord-holding clips on both sides allow for positioning anywhere. The Energy-efficient motor and impeller increase water movement with less power. This compact yet powerful circulation pump will help keep your corals, fish, and invertebrates healthy and vibrant!