Hydor Koralia Wavemaker 2 Controller Great flexibility. Connect 1 or 2 Koralia 12V pumps same or different models. LEDs on front panel indicate pump setting and functioning. Set wave effects by setting wave timer between 2 and 15 seconds or tide effects by switching the flow on and off every 1 to 6 hours. Alternate flow with pumps one at each side of the aquarium operating on minimum and maximum controls. Feeding mode. Easy to use fuction allows feeding of fish and invertebrates in reef aquariums.