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I work 12 hour night shifts so if I had my tanks following a regular daytime schedule I might get to see them for a one hour window each day. I've had mine running 5pm-1am for years and have not observed any negative effects. There is no direct sunlight on these tanks though and they're in the interior of the house with a relatively minimal amount of ambient sunlight reaching them--enough to read a book but not very comfortably. Not sure how fish in a tank that is brightly lit for an inordinate amount of time by natural light followed by artificial would fare.