Granny, if you go to a "sign's place" Sign's first , signs fast etc. And get the latex self adhesive sticky "paper,plastic , whatever it is ". You can have it in the color and size that you want. You get some soapy water in a spray bottle saturate the sticker and the back of the tank. Then apply it , you can move it around freely. Then using a old credit card or small flat piece of plastic to work the air bubbles out. Use a fresh razor to trim the edges and cut around any holes. Let that dry over 24 hrs and you have an instant background that won't come off. That's what myself, Roy, and Dr Peaches all have on the back of our tanks.