The filter is generally in the center, also I imagine the same with the lighting. As a side note, they are generally under filtered and so you would need to keep a light stocking for the tank. I thought it would be a great idea, but decided after looking into it more it probably wouldn't be for me.
FW & SW
Favorite tank right now - 72G Bowfront Wadai Tetra, Cardinal Tetras, Ghost Glass Cat Kryptopterus bicirrhis and Clown Loach Cory haven