Consider this: Drop a beer bottle and a plastic bottle, which is LIKELY to break? Same concept. And trust me, Thou shall not worry about scratches for it can be buffed out like scratches on a car ;] and once you fill up the tank with water, scratches are hardly noticeable. But if you can't afford an Acrylic/plexiglass, BUILD A MONSTER PLYWOOD BRO! Also, if you're dealing with heavy AquaScaping material (e.g rocks, etc.) Acrylic would be a wiser choice. But if you just want a bare bottom or light AScaping material (sand, small pebbles, etc) Glass aquariums are also a good choice. Fish keeping is an expensive hobby (more expensive than keeping a dog imo). Therefore, if you DON'T have a budget and just worried about Scratches? GO ACRYLIC ALL THE WAY. If you're worried about cost, Go plywood or Glass. This is my 2 cents for you. The end.