All you need to drill holes in tanks: A drill, hole saw, and template. Hole saws can be purchased on ebay for very cheap. You will have to convert to metric to find the right size and wait a few weeks for delivery as they are coming from Asia.
The trick is to go slow and NOT apply too much pressure. Let the drill do the work. This is very important with thin walled tanks as any pressure will crack the glass. I like to add water to the glass as I'm drilling to reduce the temp and wash out the dust.
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