10-26-2009, 11:37 AM
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Acrylic actually has many advantages over glass. To name a few it's stronger, weighs less, more flexible, no chance of leaking... The main deterrence in my opinion is that is costs a whole lot more than glass, so glass is preferred by the average fish tank owner any day.
As mentioned above, it does scratch extremely easily compared to glass, but that's why they make cleaners and srubbers specifically designed for acrylic that will not scratch the tank. On the plus side, scratches on acrylic can easily be buffed away without harming the fish. Coralife makes a decent product to buff away scratches inside the tank.
If the price was cheaper, acrylic would be the best choice, but for a lot of people, me being one - glass is just more affordable, and fairly strong and durable.