I have seen some folks say that they want to stress their fish less.
I do like to have periods of time outside of my photoperiod for viewing, so I will run the lights at 10-20% during that time. I have wired my lights through a smart dimmer though so it gives more of a step change rather than a ramp though.
My fish react better to it. With lights just clicking on from 0-100%, they would freak out and dart around the tank. Now they just act natural and calmly swim about like normal when lights are coming on. Plus I think it looks neat.
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