Going well...I've eased up on watering to test a theory: with the air stone at the bottom, I think that part dries first but regular watering keeps the top half wet. I think this is what made for a giant solid root ball in my previous air pump experiment - she dried out from a watering volume miscalculation. Not showing any deficiencies so far so I think it's doing no harm at least.
Her mainlined tops are all coming along nicely, gonna flip her in the next week or two