I have a 280 starphire, and I have one small scratch that I did with a MagFloat way back when. And this was enough to convice me that I would never have an acrylic, not even 10,000 gal, unless it was about 10' out of reach of any visitors, or myself. It's practically impossible to clean these tanks without eventually scratching them. But I'm waiting, because I'm sure there will be somebody to jump in on this with their personal history of going 25 years and it's a God send material.