I was thinking of using a mirror as the background for my 29 gallon, to give it the optical illusion of more space, fish, plants. It's a community schooling tank, hopefully planted eventually. What do you think? Would it be a good idea? Has anyone here ever tried this?
Personally I'd go with a normal black or blue background. The mirror could make things look too busy and actually take away from what is on display in your tank. A simple black background will help focus your perspective on the actual scape. But it doesn't hurt to try too!