Originally Posted by Amicus
Could some help me with some advice on how to drill a hole in the bottom of a tank? Is there a way to tell if the glass is tempered? All advice is appreciated.
I'd be leery of drilling it. Untempered glass tends to have a more tinny sound when lightly tapped with a metal object, whereas tempered glass tends to sound more like a thud. Certainly this isn't a fool proof tests, but I've been lucky with it so far.
A good test to get the "ear" for it is to tap test a smaller window in your home that more than likely isn't tempered and do the same to a sliding glass door, which by law has to be tempered. You should hear a distinct difference in the two types of glass.