I picked up an old flat back hexagon aquarium from a family friend who didn't want it anymore. Problem is the back has a mirror finish that's about half chipped off. I tried removing the rest with Goo-gone and that didn't work at all. I'm gonna buy a razor tomorrow, but I have a feeling it's not going to work like I hope or it's going to scratch the glass. Any suggestions? It'd really be a beautiful aquarium if I can just get the ugly mirror finish off the back.