If you build your own, you can locate the hinge between lights or fixtures assuming they aren't mounted far above the tank. I have two light fixtures that I just set on top the glass. By putting the hinge in between them I can set one fixture on top of the other, then open the front half of the canopy to work on the tank and still have plenty of light. If you don't need the hinge, just have the local glass shop cut you a piece to the exact size you want and cover the whole top (or half). That will also let you get rid of the flimsy plastic piece that usually attaches to the back of the canopy. They generally aren't sturdy enough to keep fish from jumping out of the tank, or heavy objects from falling in; for example cats.
Last edited by smannell; 06-18-2011 at 02:00 AM.
Reason: fixed typo