OOcchhh, you diden't want the glass tampered
Don't worry, I've made this mistake before with my custom, it just means you are going to have to be
extreamly careful when working arround the tank. As an ex glass worker, I'm shure you'll be able to sus why I say you diden't want the glass tampered
What happens when you knock the glass in the wrong place; it breaks. However, how dose it break? Tempered into loads of little pieces, standord just cracks. If you knock a rock into the tempered pain, assuming enough force to break it, the pain just blows out and the tank's contents get onto the floor in seconds, usualy injoring anyone infront of that pain. If you knock standord glass, it cracks and water starts seaping out at an alarming rate, but you get a few minuites to rescue the livestock, and the pain should stay in place, avoiding injory to people working arround the tank. It's only an issue if you knock the pains hard enough to brake, so you can still build the tank from it, but it's not the type you want for an ideal tank build
Also, drilling can't be done on tempered (not shure about CAM'ing it mind) so that makes modifications more difficult later...
£70 for the glass is cheap. The pleasures of "staff rates"
All the best
Rabbut