At first I'm going to use the mag solely for the return, which will be going to the main tank and also the refugium. I planned on at least 6 holes in each 'arm' of the pyramid, and if that is still too much current, then I will use the mag to power my remora pro. The pvc up to the pyramid is 1", and the actual pyramid is 3/4".
So basically, I'll have 2 overflows rated at 700gph each, one going to the refugium, one to the sump trickle filter. The skimmer will be in the refuge, and the overflow from the refuge will go into the sump. The mag in the sump will go up one pipe, then split into 3, the left going to the refuge controlled by a ball valve, the right for water changes controlled by another ball valve, and one straight up to the pyramid in the tank. I'll post more pics as I go along.
Ben