What is the dark brown spots on my leaves? Nute burn? Not enough cal mag?
Please help with any suggestions!!
Plant is about 4 weeks old
DWC
5.8-5.9 PH
725 PPM
Have added Cal Mag, fox Farm trio (only grow big, big bloom so far)
18hrs on cycle
Temp is 80.2 day and 78 night
45-60% humidity