Today my 2 3/8' glass grill bit came in the mail.
After a little prep work I drill drilled three holes on about 20 minutes. 1 hole in the bottom of the tank and two holes on the back side of my sump.
My finger is on the new hole.
The hole on the right is going to the intake on the return. The hole on the left is to be the outlet from the drain of the overflow box