I noticed my leaf edges curling in about a week ago. Then these rust spots started showing up on the upper leaves. Any ideas? I think its a Mg. deficincie but im not sure. I added cal-mag when I changed my rez 2 days ago.
My Setup
DWC
Temp=77
PH=5.7
Nutes= B.C. (Technaflora)
ppm=950 (less then...