Plumbing I.D. Question

[tikalize]

I bought a Pan World 50PX-X. I was wondering what size Flex hose i should use 1" or 1 1/2". I wanted to run 2 exits in my 80 & i see with larger diameter hose the head difference is about 70 gph more with 1.5" even with more 90s Thanks........

 

[tikalize]

http://www.reefcentral.com/calc/hlc...Couplings=0&CheckValves=1&Exits=2&Entrances=1

 

[tikalize]

http://www.reefcentral.com/calc/hlc...Couplings=0&CheckValves=1&Exits=2&Entrances=1 The high # of 90s is for a PVC manifold.