I'll echo that last statement. Glass is much heavier and more brittle, but difficult to scratch. Acrylic is very light and strong, but I hate how easy it scratches. I have both. Recently I make the mistake of pressing too hard with a paper towel while cleaning the finger prints on my acrylic tank, and now there are light streaks that are scratched into the front surface. The light makes them stand out horribly. My vote is for glass, if its anything under 125 gallons.