while on the subject of glass?

[bigffish]

I want to cut holes/ drill holes in tank bottom, what kind of bit or hole saw is required. Thanks for entertaining me, Bigffish

[BruiseAndy]

http://business.search.ebay.com/glass-hole_Business-Industrial_W0QQcatrefZC2QQfromZR40QQfsooZ1QQfsopZ11QQsacatZ12576

[BeanAnimal]

Many tank bottoms are tempered. You can NOT drill tempered glass. Check with the manufacturer to see if it is tempered.

[alexb518]

the way to tell if it's tempered is to run a glass gutter across it. if it's difficult to score, then it's tempered. but if it scores easily...you're good to go. and to answer your other question, you need a diamond blade. or, have your local glass shop do it for you.

[BeanAnimal]

I certainly would not score tempered glass... it may very quickly lose it's temper (no pun).