I really think TMaier is giving solid advise. You'll be amazed how much more your fish will pop with a black background. I say give it a try. It'll cost $5-$10 and if you don't like it you can go back to the one you have, but I doubt you would.
I was skeptical of using a solid background/painted tank for a long time. After giving it a try, I'd never do anything different.
Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime.