Darren, I found your lighting set up :)

[Achilles]

I agree with Tony to an extent. I believe that sunlight can cause an imbalance in a system simply because suddenly the system is recieving a great deal more energy than it used to. The system needs to adjust to this influx of energy. Just like adding 400 MH's to a tank that previously had NO tubes... for a while new algaes may pop up, but the system will re-equilibrate given enough time.

One last thing of interest I would like to share, for I to hope to one day have natural light as part of my reef display. I saw this type of light duct on one of Bob Villa's Home Again programs a few years back. It used something similar to a flexible dryer duct to bring light down from the roof into hallways and rooms within a house. Sort of a miniature skylight that you could moderately bend and flex into a position you wanted. They were about 4 inches across and looked perfect for the task. I am concerned about what would be lost (Spectrum etc.) from the light however...

Anyway, all these points are IMO.

Cheers!

Jeff O'Neill