What to use for background?

[monza]

All those suggestions besides paint work if you can access the back glass for cleaning. My tanks are as close to a wall as possible, the plumping keeps it a bit off. So if water spills down the back some how and went between the glass and non painted backing I could never clean it without draining the tank.

Coroplast is the other name for the cardboard like plastic. I believe Stanley’s sells it as well.

Dave