here is a lil tip you can run the pc into 50/50 bulbs for the one row, and the second row have it in Actinics.
but possiblity convert your HQI's into a 150 watt 20K blue to support the deepwater corals. sometimes it is nessesary to slowly bring some blue to the system, instead of providing more of the 10K-13K specturm.
for example:
Wavelets on the water surface act like a lens and focus the lights causing glitter lines. These beams provide a strobe effect that increases the light intensity illuminating the bottom. Briefly countering the attenuation of light with depth. They have been measured as having up to twice the intensity of light incident on the water surface. The effect requires a point of light, such as a sunm metal halide, HQI or halogen lamps. etc etc...
Reflected up off a white sandy bottom they also illuminate the undersides of a reef ledge.
Hope all this can help the theory of light illumination.
PM me if you have sum question