The closed loop is very basic and in fact I will be modifying it shortly by incorporating an Oceans Motions 4-way valve and adding two more returns in the center of the tank. I crudely marked up a couple pictures showing the intake hidden in the rocks and the two returns at the other end of the tank which now only provide constant flow.I would love a picture/diagram of the setup
I will also be using Oceans Motions Omni Flex Nozzles to get rid of the 45 degree PVC fittings and to provide more flexibility of directing flow. I will update the closed loop system once I modify it using the 4-way valve and nozzles.