I purchased a 75g All Glass Aquarium co. tank from someone who had kept bearded dragons in the tank for the nice sum of $100. I was originally going to use the tank as a sump/fuge for my 180g tank, which is now up for sale. My wife doesn't like the giant glass box in our apartment, so we settled on using the 75g. The 75 didn't have any overflows, so I drilled my tank. I researched several websites before drilling and most said that the tank did not have tempered glass sides. The first hole took almost an hour. I was afraid of breaking my tank so I went slow and flushed the area often. Glass-Holes.com dope aquarium stuff was very helpful along with several youtube videos.
For anyone who is wondering what happens when you drill tempered glass here is my 10g practice tank:
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