some leaves thin, curled-upward, browning edges

[Baruce]

You might put up a thread asking for rockwool information in the hydropnics section. Can't help you there because I don't use it myself....but lots of people on these boards do.

I wonder if the rockwool has anything to do with it?

Oh, and I was wrong about the nutrient name, it's Supernatural Brand Gro Aqua (17-7-18)

ok, then overwater/over-fert, I also have an electronic Hygro/temp

But what to do?