So this is the second time with this issue, third grow with this system.
Grow #1 went off ok, not great but ok. +/-1.3 potato per site.
Grow #2 and now week 3.5 into grow #3
Current system design: UDWC with Areo root halo, 1800 gph. 20 gl. round cans, Straight line configured, 5site, 40"on...