Originally Posted by cicfish
Thank You! Thank You! No, I do not have live plants and I had thought of the timer. The room gets daylight so I am going to leave the lights off. Currently I don't turn the lights on until around 8 am, but I may adjust this in light of the new information.
As you have no plants, your fish for their part would be fine without a light at all. In their native habitats, many of the fish we keep are in very dimly-lit waters. Daylight in the room for the day and total darkness at night would be OK. But it's nice to see them
so we use a tank light. Having it on a regular schedule is best, the fish's metabolism is in sync then. Just like humans; I heard on the news only this week that people who work shift work have more trouble with the 12 midnight to 8 am shift, simply because of our internal "clock." Fish have these things too.
Another point, when the tank light comes on and when it goes out, there must always be some light in the room so it is not a sudden light/dark situation.