This was copied off of All-Glasses' FAQ page.
Can I drill holes in my aquarium for external filters?
Maybe, many of our aquariums are made with tempered glass in the bottom. Tempered glass cannot be drilled. Non-tempered glass panels may be drilled by a qualified technician. In some cases, you may special order All-Glass aquariums pre-drilled with the MegaFlow or Twin-Flow overflow systems. You could also special order, in some cases, an aquarium with non-tempered glass if you wanted to have it drilled outside of our facility. If you have an older tank that you want to drill, don’t take any chances - if you are not sure that the glass is non-tempered, do not drill it.
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Maybe I should have said they use tempered in their bowfronts unless you buy reef ready but that still goes against what the Hagen rep told you. The fact is though that their website does mention tempered bottoms on many of their aquariums.
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