Ok, here is the deal...I am trying to upgrade my system. I was wanting a 29gallon frag and a 29 gallon refugium. I got the bits and starting drilling, however I ran into some difficulty. I ended up drilling 3 tanks, all 29 gallon and they shattered like a spider web. I had asked several people before I started drilling if 29's were tempered and everyone didn't thinks so, but after drilling I am starting to think they are. I did drill another tank...the 4th one is also a 29gallon and had no problems with it, not to mention I drilled another 29 at the tank drilling session in CR last year. I have drilled other tanks without any problems. So, I am wondering has anyone tried drilling a 29 gallon tank? Did you have any problems? Are some or all 29 gallon tanks tempered glass? Or did I just have bad luck? I made sure I went slow and not to apply too much pressure...so I just was wondering what you opinion is.