Ok, I have a 190 gallon aquarium( in wall) that I am setting up, it has overflow box with 3 holes drilled, 2 holes with 1-1/2" bulkheads and 1 hole with 1" bulkhead. I also have 4 holes drilled in the back with 1" bulkheads.
My return pump is a Sequence Marlin (2050 GPH), it will also be teed...