Originally Posted by kmiceray
I will play around with that and see if I can find a fit where the light is on mostly when I am around. But I will be careful and try to give the fish a feel of day/night as you suggested.
As an example, my tank lights are on from noon until 8 pm. You could have them come on at 3 pm and go off at 11 pm if you are usually home evenings for instance.
However, one important thing to bear in mind: fish need a period of total darkness, no ambient room light, complete darkness. I wouldn't go less than 8 hours for this dark. And second, there must be room light when the tank lights come on and go off, to avoid stress on the fish from sudden light/dark. I am working on an article on light and fish eyes that will detail this more, but it is very important. In my case for instance, when the tank lights go out at 8pm in winter it is total darkness outside, and I have a fish room, so there is a wall light that is also on a timer to come on a few minutes before 8pm and remains on for an hour. At noon when the tank lights come on there is daylight from the windows.