i like the layout you've got. I think the big thing is where do you want the actinics, which is what I assume those blue bulbs are in your diagram? The whole look of the tank can change if they are in the front or the back. I like to keep my actinics in the rear, seems to me that when the daylight bulbs are in the rear the reflection off the back glass makes the setup look harsh, but I like a very soft blue glow.
Guy