Center Overflow - Size question

[Todd]

Thanks for the reply. I was thinking about having it in the center, and not near an end - it would be a custom tank. I am just concerned that having a big black box in the center of the tank will look horrible, and even more so if it is put against a wall.

I was hoping that someone would have, or have seen a tank with a center overflow and give me some feedback on what the 'proper' dimensions for a center overflow would be (ie how big the tank should be, for it to look okay).