07-29-2010, 11:52 PM
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The light over an aquarium should never be on for 24 hours a day. Tropical fish live in the tropics (naturally
) where they have equal daylight and darkness, about 10 hours each, with 4 hours as dusk and dawn. They need total darkness of about 10 hours, so they can "rest" and like us, recharge their batteries. In tanks with light continually, fish are highly stressed and often disease breaks out. It just is not natural for them.
The timing of the light/dark can be anything you wish, so long as they get some complete darkness--which means no room lights. With a timer for the tank light, you can have it on during the period when you normally are there to see the aquarium, and off when you're not, provided there is complete darkness during the off time.