The Koralia Evolution 850 gph is one of Hydor's new and innovative wavemaker and circulation pumps for small reef and fresh water aquariums. The Hydor Koralia Evolution design and technology guarantees 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. High performance, low energy consumption and quick and easy maintenance. Includes cable protector and is ideal to use in tanks with urchins, triggers, puffers and parrot fish. Unlike the non-Evolution Koralia pumps, the Koralia Evolution can be connected to a Wavemaker. Please note, if you are using the Hydor Koralia Wavemaker, you will need to use one of the Koralia 12V Controllable Powerheads.