On a topic note if you use cell cast acrylic it is not that easy to scratch, you'll get micro scratches from cleaning but you can't notice those 2 feet back from the tank. I keep urchins in an acrylic tank and dispite rumers they do not strach the acrylic so I can't see a fish doing it, although possible, unlikely. Starphire glass has less iron and is quite a bit softer than standard glass and it won't take much more to scratch it compared to acrylic.
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