Do not attempt this, hire a professional with the right tools. I DRILL TANKS. I have the real, correct diamond hole saw for the job, it is nothing like the cheap Ebay thing people talk about. And a press is a pain the arse to use on tanks. Talk to LFS's and find someone experienced to come out and drill for you. Also, it will not hurt the integrity of the glass, that is not a concern. You will use a bulkhead, not random PVC parts. Furthermore, this is a 300 Gallon, you are going to want some big holes drilled, probably want to use 2" bulkheads, as opposed to the standard 1" ones, at least for the drains.
The real bit to use is available from a place called Whitney Supply Co., Enfield, CT. I purchased 6 bits before I found this place. Yup, 6 garbage bits, such as the electroplated diamond bits that many vendors sell. I also use a Baldwin Drilling machine and I use Anti-Freeze when drilling, not water.
The real bit to use is available from a place called Whitney Supply Co., Enfield, CT. I purchased 6 bits before I found this place. Yup, 6 garbage bits, such as the electroplated diamond bits that many vendors sell. I also use a Baldwin Drilling machine and I use Anti-Freeze when drilling, not water.