slipknottin said:While I agree with the thermal properties. I disagree with the light tranismission. There are various qualities of both acrylic and glass. Low E glass has nearly the same light transmission as acrylic, and has nearly the clarity as well. Acrylic is stronger, but softer. Scratches can be removed from both glass and acrylic, by the same method. Its harder to remove scratches from glass for the same reason its harder to put a scratch into glass, its a much harder surface.
I should have mentioned that when refering to your average glass tank these properties are the case. As slipknottin stated there are super clear glass products plus this has not been mentioned but there are also glass products that are stronger than and safer than acrylic but for your average fish tank this products are not used becuase of the cost factor involved(prices are usually much higher), and for that reason acrylic is far clearer and stronger than your average fish tank.