2 return pumps

[Gavinsredseareefer]

Fellow Reefers,

 

I am trying to run 2 COR 20’s from a basement to the top floor but having challenges. Anyone run two pumps in a sump and can I see what your plumbing looks like? I am getting one to work but the other isn’t because the 90 degree turn isn’t functioning as expected. Many thanks 

[Saltcreeper]

I run 2 m2s but only sump to tank and sup through uv...so probably won't help. Let's talk head pressure and how far you're trying to pump that. Cors ain't what I'd call " strong pumps"