I'm setting up a 40 gallon SPS tank. I'm using a Mag 7 and I'm expecting it to be running about 400-475 gph. It will be returning about 4' high through a check valve, and two Innovative Marine "Spin Steam" returns I was planning on using a single 1" bulkhead with a Durso overflow. Now I'm wondering if I should use a 1.5" bulkhead instead. My overflow is in the corner of the tank and is a total of 10" of weir. I'm planning on cutting 3/16" deep 1"4 wide overflow teeth but was considering a smooth overflow with no teeth. I think for surface skimming a smooth overflow would be optimal but I've read that it also makes it easier for fish to get sucked over, along with food and other stuff.

Will I be fine with a 1" bulkhead or should I use a 1.5" instead? Is anybody else running an overflow without teeth?