Two questions for all you DIYers out there, how easy is it to buff out acrylic? Also how easy is it fix an acrylic tank that has a leak. I have my eyes on a 240 acrylic tank which is a bit scratched up and would need to be buffed and the guy says he has never filled it, but was told when he bought it that it held water. It's a bit of a gamble but the price is right. Just wanted to cover my bases in case I had to do a repair and buffing.