Don't know if it makes a difference for fish, but reptile keepers usually do 12 hours of daylight in summer, down to 10 hours in winter.
Light on or off during the night?
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The tank in my daughter's room has the light on all night and it's off during the day. She uses it as a nightlight...it's something fun and iteresting to look at while going to sleep. 
I also use timers. The cyclical nature of light/dark is important to them, I would say, just as it is to other life (think how depressed people get in winter with less light).
In summer, when it is hot, I won't turn the lights on until 6pm or so (the rooms stay dark anyway) and leave them on until 2 am or so. When it's not really hot, I adjust them back to whatever the cycle is outside, ie. I adjust their light for daylight savings and all that jazz.
Fish don't have eyelids, so they probably appreciate the dark for "sleep". Also, the dark helps them feel protected so that they can rest.
In summer, when it is hot, I won't turn the lights on until 6pm or so (the rooms stay dark anyway) and leave them on until 2 am or so. When it's not really hot, I adjust them back to whatever the cycle is outside, ie. I adjust their light for daylight savings and all that jazz.
Fish don't have eyelids, so they probably appreciate the dark for "sleep". Also, the dark helps them feel protected so that they can rest.
Allot of very good answers to this post.
Your Aquarium needs black out time "dark Time" just like most everything else.
Leaving lights on all the time is not healthy for the fish and plants,,,,,,
Someone told someone asking on day this
"leave your lights on in your house all the time ans see how you like it, you don;t like to sleep with the lights on do you?"
it was a very good point.....
My lights on my tanks are not on any set times on and off, just when I get up and do it, and everything in my tanks are good, although I will end up with a timer on some of them when I can get ahold of a few bucks......
Your Aquarium needs black out time "dark Time" just like most everything else.
Leaving lights on all the time is not healthy for the fish and plants,,,,,,
Someone told someone asking on day this
"leave your lights on in your house all the time ans see how you like it, you don;t like to sleep with the lights on do you?"
it was a very good point.....
My lights on my tanks are not on any set times on and off, just when I get up and do it, and everything in my tanks are good, although I will end up with a timer on some of them when I can get ahold of a few bucks......
I was lucky enough to be given a timer when I was given my tank 
The light comes on at 8am and goes off at 8.30pm every day. Hehehe, my guys know that lights on mean breakfast Without the timer, I know that my light schedule would be very haphazard, as I don't always get up before 8 at the weekends 
D
The light comes on at 8am and goes off at 8.30pm every day. Hehehe, my guys know that lights on mean breakfast Without the timer, I know that my light schedule would be very haphazard, as I don't always get up before 8 at the weekends D
