Getting ready to drill my tank and I'm pretty sure I did the test correct and my bottom is not tempered. Here's a video let me know if I did it right. Used a polarized filter on my camera.
bottom test for tempered glass:
http://youtu.be/EnOrNIyIG9o
Side test for temperad glass:
https://youtu.be/IqHk5qRtmH4
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