Doug,
Just curious - why don't more people shoot with a flash on their reef tanks? For me, that helps get the color back into a range that the camera can more easily deal with. Sure, you have to deal with backscatter and flash glare, but that can usually be dealt with using an off-camera flash, shooting at an angle, or getting really close.
I also have the personal worry that extremely blue light (super actinics, etc.) give cameras problems other than just white balance - like those wavelengths are not handled by the lens properly or something. Have you ever stared at a super actinic and seen little blue squiggly lines moving around? The human eye picks up some sort of artifacts, and I just worry that lenses and sensors might as well....
Jay