Please offer any advice.
Indoor
Soil: Biobizz All Mix
Nutrients: Biogrow, Bioheaven, Biobloom, Topmax
Runoff PH 6.6-6.7
They are 2 weeks in flower. Yesterday (day 16th flower) one of them started show these symptoms in a few of the upper leaves (one node below the main colas)
The 2 first...