I'm preparing to drill my 72x24x30 220gal tank. I have a toothless ghost type overflow from modular marine. Should I match up the top of the internal box to be at approximately the same level that the bottom of the teeth for the original corner overflows were at? In my mind, that should keep the tank water level where it was meant to be by the manufacturer. For obvious reasons I don't want to screw this up lol! Thanks!