where to get glass bit?

[Richer]

The people who drilled my tanks took it really slowly in the beginning and scored the glass enough so that they could set the diamond bit into the grove. After that, a spray bottle of water and a few minutes of drilling was all it took to get a nice hole. Another friend of mine, made up a template for his bit to help keep it steady. If you have access to a large enough drill press for your tank, by all means go that route... its a heck of a lot easier... but you don't need it if you take your time.

-Rich