The Hydor Koralia Wavemaker system is designed specifically for use connected to the Koralia 12V pumps (Koralia Nano 12V, Koralia #1 12V, Koralia # 2 12V, Koralia # 3 12V & Koralia # 4 12V). The Wavemaker 2 can control two Koralia 12V pumps (pumps not included).Wavemaker Functions:ALTERNATE FLOW: With the Wavemaker you can create quick alternate pulse-like flows for a wake effect, or have a tidal effect by settings the flow to anywhere from one to six hour alternate periods. Alternating between the two pumps can be anywhere from a minimum of two seconds to a maximum of six hours.SYNCHRONOUS FLOW MODE: The two pumps can be set to gradually increase flow from a minimum to a maximum setting.FOOD MODE: In food mode the pumps can easily be turned off for feeding periods.NIGHT MODE: For night mode the pumps can be set at minimum power.