Ken,
I have yet to figure out how to take top down shots on a 4' deep tank. I guess I need to put some kind of scafolding across the front and back to lay on while taking the photos. I tried to take some from the front access panel, but when I squeeze my upper torso inside I am too close to the water level. I might have to build me a photo box of sorts, or get a underwater housing for the dslr and have my boys go snorkling!!!!!!!!!!!!!!!!
Brent