I would have to agree about the 55g tanks not always being tempered. When I contacted AGA they said that the bottom of all the 55g tanks came tempered, and the only way they tempered the front/back is if it came in a "combo" is what she said. But, you can also measure the glass on the sides and front/rear and relay that to AGA and they can tell you if it's tempered or not.
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