You can also have them both on in the day, then have the 10000k's shut off an hour before your actinics. I like to think of this as the evening, then have the actinics shut off, and then the moonlights come on. I have no idea, but I wonder if the fish like it better having the light gradually decrease in brightness? At any rate, it's kinda cool.
125 gal. reef w sump/refugium & 8-bulb 640w T5's
45 gal fresh w/plants + CPF lighting