Koadog,
I had the same exact issue... getting back into the hobby and tried to do things right... this is what I have got going now....
closed loop measurements:
three drains connected by a 1 inch Cross PVC Socket Fitting
forth hole goes to the pump inlet:
the return is split by a Y ...
Curious on to which software you used to create the above design.
Planning on a new system and would love to create a similar design for review by other board members. :?:
Well maybe two besides yourself...
Just getting back into the swing of things...
PS let me know if anyone at the upcoming meeting knows of a larger glass tank for sale 180+