Hi Mike...

You can do a background or do rocks and caves. Backgrounds are neat in the fact that they are in the back and leave more foreground space for the fish to swim in.

However, good luck trying to catch a fish with a background, especially if they sleep in the background. Once they sense the net, *voom* into the background.

I personally would save the money and just get holey rock and a paper background.

Hope this helps

chiu