Hey, you read my mind ... I was thinking about this same thing with my tank. I currently have just metal halides over my tank, and after seeing Mama's tanks, was thinking about adding in supplemental actinic.
Now, to those suggesting upping the K on the bulb. Yes, you get more blue with the 14K and 20K bulbs (I am running 14K phoenix bulbs), but you don't really get the color "pop"/"glow" that actinics bring out in corals.....