Glass vs. Acrylic - The First Tank Guide - The Differences Between and the Debate About Glass Aquariums and Acrylic Aquariums: "Glass is very difficult to scratch. Scratching glass usually requires a relatively hard material and a considerably amount of pressure. You can scratch glass if you take a piece of uncoated aquarium gravel or a rock and rub it against the glass, or if you take a piece of metal and deliberately scratch the glass. However this is unlikely."
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