drill

Need advice please! I was drilling a 2” hole today, chipped out at the very end. :( Hole is 4” from top 4” from side of back glass... should I trash this tank? Or is it repairable? I see no cracks radiating from hole, just scalloping. Marineland 120 XH, 12mm glass thickness. Thank you!

So I have a 240. 8 x 2 x 2. I drilled the aquarium myself Built My Own sump Built My Own stand and everything is going great except I cannot get the flow through my overflows I expected. I have three one-inch overflows drilled into the back of the tank and two three quarter inch return lines...