I havent put anything on my frog tank walls, but it's interesting behind the tank on the wall there is a painting of a landscape, and my frog aways positions himself so he is looking in that direction. Sometimes he climbs on that side of the tank , so maybe he thinks the picture is real..I was thinking of putting mirrors on the sides and back of the tank- but how would my Pacman react to his own relection? Any ideas? Should I keep the tank walls bare, or give my frog something interesting to stare at?