These will be weekly to bi- weekly maintenance hogs as they loose a large percentage of their flow weekly. Depending on tank, you could easily loose 15% of their flow weekly.Back in the day (15 years back) I ran a two Mag9.5's as a return and skimmer pump and Koralias in tank. With my next build, I'm gonna run Sicce Syncra 9.0 (x2) for returns, whatever comes with a RO Regal 200SSS Skimmer and Maxspect Gyres in tank. I'm basing my choices on research done independently. I have read that the Gyres CAN go sideways a tad easier than others, but I like the idea of both power and directional opportunities they afford.
I love my XF350's ( When they are Clean )