[Sk8r]

I've done that so far.
Haven't got a spare mj 400. But it's my hope the eggcrate 'floor' will serve as a baffle-barrier to the thicker slurry and let just enough get up to the mj 1200 to imitate the medium-filmy water my reactor delivered at its best performance, as compared to the thoroughly settled, nearly totally-clear non-stirred water it delivered when the stirrer broke down.
To explain: when running properly, my proper reactor had two zones: the delivery area [middling filmy, between clear and slurry] and the slurry area. I'm hoping to duplicate that on a larger scale.
But you may be right, too, sjm, and thank you for the info: good to know there's a middle ground. We'll see how this develops.