The Hydor Koralia Pumps are a new innovative range of circulation pumps for aquariums. The exclusive Hydor design and technology guarantee a continuous and powerful water flow which can be directed freely thanks to the special sphere shaped connection to the exclusive combination suction cup and magnet support. Dynamic, fully submersible water pumps revitalize hard-to-access dead spots in your aquarium. Magnetic base with articulating ball joint allows a full, 360 degree range of convenient pump positions.Directs vital water movement to areas of your aquarium never possible with conventional power heads. Patented impeller design generates water flow that is both powerful and delicate - ideal for marine and reef aquariums.Extremely low energy consumption. Suction cup and magnet mounting system measures 2-3/4 diameter and is suitable for aquarium glass up to 1/2 (15mm) thick.Designed to be super efficient and long-lasting with very low energy consumption compared to traditional circulation pumps.