holy rockwall batman! massive amounts of rock - how many pounds? is there still a good amount of swimming room for larger fish if you plan to keep them? also, that is sort of how i planned to do my rock originally but i realized that the coral needs flat real estate for placing... how will you tackle that problem?
also for taking pics, depending on the brand/quality, you should have a white balance adjustment, and hopefully an auto-white balance adjuster. thats a great way to readjust the camera to changing light scenarios quickly and cleanly.