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The light might startle him, but rather than the light/dark being irregular, my concern is about the temperature fluctuations the light probably caused. I had a similar, if not the same, tank when I was just starting out. I heated the tank with a non-adjustable mini heater, so when I turned the light on and off, the temperature changed dramatically. I didn't realize this, unfortunately, until the fish came down with a bad ich infestation. He recovered from it, but wasn't really the same afterward. Since then I've only bought adjustable heaters and tanks with fluorescent lights.
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