I was referring to how much light the fish need,dont like the idea of lighting the tank whilst house is all but empty during the day,Tank is in a shdy corner away from sunlight, so by setting the timer for 6 hours from 5 to 11 pm, is this now to much light for the fish ?
John.
I don't think that will be an issue. You might notice that they get a bit jumpy when the lights go off and they plunge into darkness at 11pm, but they will only take a few seconds to settle down.
Fish dont actually 'need' the tank lights. As long as the tank isn't in a room with no light source then they will be fine. Most of their natural habitats are darker than we provide anyway.