I bought a 95 gal acrylic tank for a corner. It had real ugly 3-d background that needed to be removed. I have cleaned and polished the tank but I can't seem to get rid of all the silicone that held the background in place. I've seen some nice 3-d backgrounds that I like but I don't have the money right now to get one. I guess I'm looking for ideas to cover up or remove the silicone residue on the inside of the tank.