Last time I looked at Aqueon tanks at a LFS the guy working there said Aqueon is now tempering ALL the glass in ALL of their tanks. I didn't believe him but when we looked at the tanks themselves they had a factory sticker on them saying that very thing. "DO NOT DRILL, ALL GLASS IS TEMPERED". Sounds like a gimmic to me to get us to have to buy their specialty pre-drilled tanks instead of doing it ourselves anymore.