Drilling holes in your roof and installing solar tubes for a frag tank will do nothing except earn you a prime location in the book of dumbest reefer's ever.
For a frag tank keep it simple, go with a DIY led 50/50 array of white and royal blue. Save money and go non-dimable as this won't be overly useful on a frag tank. A 48 LED kit is probably about the right size for the tank. Once established with proper flow and water chemistry, if you still find growth lacking it'll be easy to add additional LEDs as you see fit.
http://www.rapidled.com/48-ultra-pre...-non-dimmable/