Caviar

I now have two frags of soft corals, a zoa and I forgot to ask my LFS what the other one was. I got lost in its awesomeness and made a hasty purchase. Take pics tonight.

But, my question is this: Should I continue using 10K bulbs during the day, and switch to 420 actinics at night? or invest in a dual bulb hood and use both lighting all day? I just want to check and make sure I keep my coral buddies as healthy as possible.
Any input is greatly appreciated