Planted Tank Enthusiast
Join Date: Nov 2003
Location: Vancouver, B.C.
Save yourself some time money, and sanity.
Buy a proper reflector, these are often overlooked, but a good reflector can greatly increase the light in the tank.
If you absolutely cannot afford one, the next best option is glossy white paint. You may want to shape the top so it aids in reflecting light into the tank, not just a rectangle shape.