is every piece labeled tempered? all my tanks came with a sticker said tempered. im sure was just the bottom since i drilled all three without issue. every piece should b labeled. to b sure use polarized glasses and a white lcd screen. i did it on a full tank.... thats how confident i was.

Im not sure, only one panel has the sticker under the rim on the glass. and im not sure i understand your sunglasses LCD trick

if its on one of the upper panels its likely ALL tempered. every piece should b stamped tho somewhere. mine just had a stickers on the bottom of the tanks. the polarized glasses trick is slick tho! im sure u can see it on youtube, can b done with 2 pair of sunglasses tho with no lcd screen.
heres a like how: http://www.youtube.com/watch?v=Zp7kuKMmDg8
this ones done with a polarized fiter on a camera: http://www.youtube.com/watch?v=UQicz...eature=related
sorry to get off topic, just random info i thought was handy...