Originally Posted by roka64
To add to the lip on the top, I would add a lip on the bottom, to keep the board from sliding....
After you fill the tank with water, it's not sliding anywhere. I did have a lip on top of mine, although I made the whole thing too big and ended up filling the gap with decorative marbles. I made the lip tall enough to cover the plastic stripping on the tank, for astetic reasons.
The tray also came in handy when needing to move the tank. (I was in collage, went home every summer and took my tank with me.) I didn't have to worry as much about stressing the tank during the move, as it was always going to be supported on all edges.