Thanks Renegade. I searched everywhere for almost a whole day........
Some said yes, some said no, Aqueon listed the bottom as tempered but stated nothing about the sides....
I told my wife I was going to drill it, but wasn't sure if it was tempered and if it was it would shatter....
She said, "Well your better try so if it breaks we can go get a new 55." lol
She's pretty supportive, even bought me a 40 gallon breeder for our anniversary yesterday. So the 55 will be a fish only I think, and maybe a reef in the breeder. (I had a hard time deciding between the two tanks when we were at Petco.) Now I have both!