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Yes just the bottom is tempered glass, there is a sticker saying not to drill bottom. As formthe overflow instructions being wrong if you place the rubber seals as Eshopps instructs you will have a leak. Eshopps instructions go as flows starting from the inside of the tank: wier box, tank glass, o ring, external box, o ring, bulkhead nut. It needs to go as follows: overflow wier, o ring, tank glass, external box, o ring, bulkhead nut. So basically an o ring needs to be on the wet side and never a dry side of a bulkhead and/or overflow. And yes the Eshopps wier slots are cut too low, if you have a standard rimmed tank you need to have the internal box as high as it can go, which is contacting the rim. Not a big deal just so ething to know before you drill you holes. I did mine about 1/16" too low and can just see the water line below the trim. I can live with than and if it bugs me I can glue a piece of acrylic inside the wier to increase the water level in the display.This is seriously a great thread. I've seen those exact tanks at my local store, and I've been too nervous to purchase. The general consensus is that only the bottom pane of the tank is tempered, but I was still really nervous about shattering a tank.
You mentioned your overflow came with incorrect instructions. Could you elaborate?
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