I love putting stuff together, especially when it works as planned!
Last night I cut all the holes in the tubs, attached the fittings and assembled the hydro rig. It worked great. The difference in the water pressure between the two grow tubs is about 1 inch. With 10 ft of 1-1/4 inch ID hose there is a 6inch differential between the controller and the first tub. I should be able to reduce that to 4 inches after trimming the hose to the correct length. After the grow tubs go into the chamber, all levels should be within an inch or two of each other. Buy turning off the pump, I measured the rate of rise and figure the system circulates completely once every nine minutes.
The water coming into the first tub through the 3/4 inch tube creates quite a bit of turbulence but only mild turbulence from the 1-1/4 inch fitting in the second tub. I'm considering adding a deflector in the first tub to prevent root damage.
Next stop, HD for lumber and fasteners.