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I find most fish will startle when going from lots of light to total darkness , the same holds true vise versa...
At night before I turn everyones lights of I make sure my main room lights are on first, so as to not plunge them in total darkness,,, give them a few mins to adjust , then turn the main lights down.. I also keep a night light going in my livingroom and kitchen,
In the mornings if its still fairly dark I turn my main light on for a few mins before I turn any tanks on....
think of someone turning a bright light on you when its dark,,, kinda hurts and startles you :)
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