10-14-2007, 08:26 PM
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I have read and experienced this for first hand that at least some fish would require the use of light on a regular schedule for their best coloration to show up. I have some goldfish and did not turn the light on for about a month, the room light was on. And they almost became olive. After 3 days of the light on 12 hours a day their color came back and after a week they were bright orange! So it might not affect their health but trying to mimic the environment of the inhabitants is usually the main goal of people trying to keep them. They certainly don't' need anything more than 2 watts per gallon to give them a nice tan.