Thanks to all. I have a Sicce 9.0 running on my Red Sea reefer 350 it has a total of three one inch elbows, an apex 1” flow sensor a 1” swing check and maybe 8 inches of straight 1” pipe. The only place it reduces down is at the Red Sea return connection. My apex is showing 512 gph with the pump at full speed. Also the pump is pretty noisy. See the pic of the piping. My skimmer is breaking in and I am organizing the wiring after I changed all of the plumbing in order to get the flow up to the recommended amount. Anyone have any ideas?