Ok so I ordered a glass hole saw kit and it arrived today. Well my ghost overflow bulkheads are bigger than the biggest saw so does anyone have a 60mm or 2.36" glass hole saw I could use? My friend is supposed to come over tomorrow morning to help me lay the tank down so I can drill it but I need the saw. I could drill the return lines if I knew what size to drill them. Does it matter how big I drill the returns 1" 1 1/2" 1 3/4"?