And for the brown spots problem, that minimally progressed. It got a hold of 2 matured fan leaves on the lowest part. I still think that can be treated next time around with cal/mag+. I don't have an exact water analysis but my initial ppm is around 130-135 and I figured there would be enough ca/mag in it.

First hydro plant - never experienced explosive growth like this (roots and foliage) - I suggest this dwc bubble bucket setup to a rookie hydroponicist