have two sets of lights, main flo lights on from 5am-10am and then 4pm-11pm (12h a day). then 5v blue neons between 11pm and 5am (theese give a little "moon" light to the tank and help to avoid scared fish) also looks cool without being too invasive.
I turn mine on when I wake up and off when I go to bed. During school this will be from 7 am to 10 pm or so. That is a little long of a day, so I think I will have to find time to give them an earlier night feeding. Some people just turn their lights on when they're home, but I think it's more natural to give the fish a normal day and night. Three poeple said they only turn their lights on during the night--why do you do that!?
if it is a gloomy day or it start to get dark, my betta fights "himself" and runs into the side of the aquarium so hard I am afraid he will injure himself. if the lights are off this behavior does not happen.