The Hydor Koralia 3G Third Generation 1350 gph Circulation & Wave Pump is compact & energy efficient, and it recreates the natural and beneficial water motion of rivers and seas. This package includes TWO of the Koralia 3G 1350 gph Pumps along with a Koralia SmartWave Pump Controller. You can create wave motion in your aquarium by using the Controller to turn on and off the TWO Koralia Pumps at intervals of your choosing.