Pre drilled very small aquariums

Does anyone know where to get pre drilled 5 gallon and 2-1/2 gallon aquariums?

Alternatively, if they're not available, how can a standard small aquarium be successfully and reliably drilled? (exactly what aquarium brand to use and how to drill them).

It seems to me that they would be extremely useful in refugiums, sumps, prefilters, and on and on. Way more elegant and useful than drilling buckets.

I notice people here needing them all the time (and not finding them) when designing their filtration systems.

They would have a hole drilled in the bottom or on the side near the bottom.

 

some company on ebay has them from 2 to 10 gallon

 

Everything you need is out here along with some instructions.

Glass-Holes.com dope aquarium stuff