If you put two intersecting pieces of glass in the corner to take the pressure off the chip, it will hold just as well as normal. Even better if you do it right. By adding the extra glass the force that would be put on the chip is put on the whole pain. Therefore nullifying the weakness. I worked in a LFS for a year and we repaired tanks like this ALL the time. Even did a 450 gal tank once with that method and the tank is still up and running. Has been for two years.