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It's fine, to my knowledge. The major cons to acrylic tanks are that they scratch really easily and they are much more expensive than a glass tank of a comparable size. The pros are that the clarity is better than glass (I believe), the seams are chemically bonded so much less chance of leakage, acrylic tanks are stronger, and they are also much lighter than glass.
No, but they're really easy to scratch while cleaning. All it takes are a few grains of sand or a piece of gravel to get in between the cleaning pad and the acrylic and the damage is done.
Oh dear... that sounds obnoxious... what really interested me was the lack of seams though... They look so beautiful! Maybe I can put up with a few scratches!