I appreciate the double check. I checked on the ladies one morning and the main air hose from the pump to the manifold had disconnected overnight — it was fine but since then I pay special attention to bubbles. Pretty sure this is a water quality issue, 360 ppm of unknown sludge that throws my nutrients off in ways that probably would make perfect sense if we understood what they were.
Funny thing though, on my last grow the plants seemed to grow out of it by about day 35 and went on to be monsters, although definitely yielding new grower quality bud.