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[Tangster]

Well a 1 in. bulkhead requires a 1.3/4 hole and that will also work for a 3/4 inch bulkhead the drains have to be 1 inch at least and 1.5 is not a bad idea they requires a 2.1/4 inch hole. I drill both corners for a drain and feed line and I installed a internal overflow box you have to use some type of overflow box so that the very top inch of the water is skimmed and pulled out for the skimmer and the sump..There are options on the overflows verticals or left to rights horizontals and on a acrylic tank its easy to install them and to drill the holes just a wood hole saw and a spray bottle of water to keep it cool for a cleaner hole. I drill my holes about 3 inches apart and I go in from the edges 2 inches from the back and end panels. Also if you need overflows to be built for the tankP/M me we can make them for you any color you'd like ? I'd also paint the rear panel