depends on the light, and the type of corals, but you do want to run your white and actinic at the same time, if your lights come with "moon light" led's, you can run those at night, but its a good idea to have those kick off after you go to bed, the fish like darkness too.
as for light times, most people run around 8-10 hours, or you can have your actinics come on/off and hour earlier/later than your daylights, just replicate the dawn/dusk effect, but it isnt needed. just looks cool.
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