A double exposure? It might look nice, shinning the tank and occupants back at each other. Some people recommend solid colors, blue or black, to keep the emphasis on the fish. My tropical tank has a "Lake Tangan...." rocky cichlid background. The boy's thought it looked cool, and I didn't know better at the time. I will be replacing it with a background with plants, similar to what Isabella, I believe has on hers. I really like that. Put it behind a tank at the lfs and see if you like it, before you buy. It's your tank, do what you want!
