I am sure that their is no real effect on the fish with either of the setups. The lose is yours and yours alone. I think that the dawn and dust look is one of my most favorite looks of my tanks. However I am the only one to see it as I very seldom have visitors to my tanks when the dawn and dust lighting is on. Our light cycles are usually set to relate to our schedules and not the actual times of the day and because we are usually at work all day we shift the high light period of our cycle from noon to 5:00 Pm thus fitting our schedules rather than natures. Our fish show no ill effects to the switch.
Tom R
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