Maybe paint your own background?
What I did for the meantime was place a white cardboard in the back of my tank. (I am an artist so I have extra paper and cardboard from past projects. I was thinking about painting it but it was too much work so I got a background at petsmart instead. =P Lazy I know. Hehehe maybe someday I will paint it but for now the background I have will work. Maybe this will give you some ideas for a BG?
http://i928.photobucket.com/albums/ad124/Treesump2/Fish/IMG_4126.jpg
What I did for the meantime was place a white cardboard in the back of my tank. (I am an artist so I have extra paper and cardboard from past projects. I was thinking about painting it but it was too much work so I got a background at petsmart instead. =P Lazy I know. Hehehe maybe someday I will paint it but for now the background I have will work. Maybe this will give you some ideas for a BG?
http://i928.photobucket.com/albums/ad124/Treesump2/Fish/IMG_4126.jpg