Just plumbed in the 1 HP pool pump , and after diddling with it for a couple of days, things are back to semi normal. I'm way overpumped for the system I have right now, but will be adding at least one more node of 4" PVC tubes ( 3 , stacked and gravity dropping) set along the outside wall of the greenhouse. These will dump into a 10' long 1' wide gravel bed, then back into the fish tank on the west outside of the greenhouse.

Only lost a few plants that I can replace with rooted…