Quote:
Originally posted by Fl_seagull
I just started drilling my 75 gal to put in a Calfo (?) type overflow. I don't use a hole saw I use stainglass bits.
Well... I cracked my first tank.
I got impatient and the bit was dull. It wasn't from over heating it was from hitting the glass  .
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sorry to hear about that. you'll get it right next time.
I drilled my holes last weekend and it was easier than I thought. I did the water dam thing and took my time. The only "difficult" part was getting the bit started into the glass. If possible, try practicing on some spare glass.