I have a tank with a similar footprint as the 180, 72" x 24". Our overflows seem to be in the same location in about 8" from the sides.
What we did was use loc-line returns with the wye fitting. We have them both pointed towards the side panels, one along the back and down with the other towards the front side corner and down. This gives us good circulation. We also have two more returns on the middle side of the overflows both facing the front glass panel and down, we push more volume than you do so we did this to aleve the current.
We had a can sitting idle so we added it to one side with a spray bar but it is really not necessary and only used for redundancy.
What we did was use loc-line returns with the wye fitting. We have them both pointed towards the side panels, one along the back and down with the other towards the front side corner and down. This gives us good circulation. We also have two more returns on the middle side of the overflows both facing the front glass panel and down, we push more volume than you do so we did this to aleve the current.
We had a can sitting idle so we added it to one side with a spray bar but it is really not necessary and only used for redundancy.