I have a concern with this set-up I am not sure anyone else has seen. Bean uses a Full Siphon I believe for Main Drain, you have your main drain from frag into main drain on DT. Those need to be seperated, and each plumbed individually into the sump, you can safely plumb your emegency lines 2 into 1, and possibly your secondary returns can be plumbed 2 into 1. You will need another bulkhead in your sump I think to make this work correctly.
2x one inch drains under full siphon will overflow a 1.5 inch full siphon, 1inch into 1 inch and you've got both tanks fighting for area to flow into where they combine, creates back pressure at the junction, the pipe with the greater water volume at higher level will drain more than the other tank.
Hey, yes if you look at the last post I changed it all up and added 3 more bulkheads to the sump, 1 for another return and two for frag tanks main drain and secondary. The emergencies are the only ones I plumbed 2 into 1.