[Nate]

Long time no see! Hope all is well!

I would not use pex, I would use flexible PVC.

And I would probably suggest 1 pump. You are going to need a decent size pump to have the head height necessary to get up there. Two small pumps will probably not have the oomph to make it or will have too many gph when they get up there .

Personally I would do a larger pump and do a T off the pump and use it as an auxiliary to throttle back the pump. Perhaps do a refugium off that line .

Need anything let me know .

Nate