I am day dreaming about my next system a 120g or 180g. I am having trouble finding options here in N. California for the tank. The only one I can find at any kind of good price is AGA Megaflow. I am planing to run the sump with the 2 1" drains and use the 2, 3/4 inch risers for sump return 750 GPH or so through sump

Also any recomendations on the size and location of holes for a closed loop system 3,000 to 4,000 GPH ?????

Any thoughts or opinions welcome.