Last step to my 45gal, I need to drill a hole in the tank outflow to the sump below. I'm using 1in ID tubing and planned on heading up to lowes to build my own bulkhead out of pvc. With this I'm unsure what size Drill head to purchase for the hole. does it matter as long as it's larger than 1in and I can create an watertight seal? Need some last minute help guys