Brad, your feeding a 1.25in. overflow with a Mag12.
I use two the same for mine. When I run a single it seems like a lot of flow for it, although it does handle it.
PC, I would also consider an in sump Coralife super skimmer for the system. Great needle wheel skimmer at a decent price. Of course if money is freely available,
, Euroreef is the top quality model. I currently see a couple of used ones in the buy/sell, both being good for your system, with the larger CS 6 being better.