Let me first disclose that I am in no way a Fluid Dynamics Engeneer...
That being said, noticing the number of 90 elbows, I wanted to share a few numbers that have been passed onto me....
I usually check, double check...ect. info that is given to me -however, in this unique instance, I have not so any input or correction would be greatly appreciated.
(1) single 90 elbow is approx equal to 100 Feet of congruent sized pvc linear friction on pump

(12) 90 elbows in a single run will shut of flow completely.

One plauseable alternative is custom bends in a pvc run.
a little heat and sand and this can save on pump wear- pump sizing, and the cost of connectors

Along with fish breeding - an account for our effeciency of energy- should be taken into consideration.
This is a general statement- presented with love to each of us that are doing our best to enjoy and grow the passion of life.
Just a reminder.