Ok this one is more or less to scale and I added a seventh light because it made the math super easy. I figure that I can play with the intensity to balance out hot spots; as you can see there is a ton of overlap. Obviously once the light hits the water and reflects off of the glass who knows where it will actually go.
The bottom rectangle is the tank, the top rectangle is the hood which I will have to remove the top panels from.
I also like the idea of setting up a rolling sunrise/sunset schedule.
What am I overlooking?
Here's the only diagram I knew how to draw for my lighting...