BioCube circulation aquarium pump simulates natural river and reef currents by continuously circulating water throughout the aquarium. With a 250-gallon per hour flow rating this BioCube circulation pump makes a great addition to any Nano reef aquarium. The pump fits all sizes of BioCubes as well as other aquariums 30-gallon and under. Our easy-lock suction cup makes installation and adjustments a snap and the energy-efficient motor and impeller increase water movement with less power. Coralife Aquariums is to create the highest quality products to enhance the experience and success of the aquarium hobby.