drilling and over flow boxes

[NanoHuman]

It is easy to drill your own tank if you have the nerve for it. Go to the home depot and buy a diamond coated hole saw (they are expensive) or you can use a dremel and a diamond coated cutter (the hole will not be as perfect doing it this way).

I purchased my overflow box from http://www.glass-holes.com/

They do very good work and have guides on their site regarding drilling your tank.