Quiet One 3000 does the waterfall filter @ about 700gph.
ViaAqua 2600 pumps through a plastic tote filter @ about 700gph. (Not shown in pics, it's just a plastic tote filled with filter media)
Cascade Internal Filter/Powerhead does about 150gph.
So should be a little over 1,500gph total flow for 400g.
I am not sure if I am going to leave the waterfall setup or not, I really like it but it's making the garage Uber humid since I can't really cover it effectively. It will stay as is for now but I may change it up in the future.