With the NEW MCR Light (Multi-Coloured Remote-Controlled) which is an automatic setting light which simulates a natural light cycle for your fish. An inbuilt timer phases the light through a 24 hour period from daylight to moonlight and back again. Simply choose from the 8, 10 and 12 hour daylight settings and the MCR light will do the rest. You can leave it running 24/7, so if you are late home or away on holiday your fishs routine is not disturbed.