Hi. Some kind of deficiency or sickness appeared o...

Das liegt definitiv an der falschen Calzium und Magnesium ratio. Da fehlt Magnesium auf alle Fälle. Erste Hilfe ist Bittersalz auch Epsomsalz genannt. 2 Teelöffel davon in 0,5L Wasser lösen, pH-Wert auf 6 einstellen und dann morgens und abends 1x auf die Blätter sprühen.

Stop using ca mg

Phosphorus or magnesium deficiency, think magnesium more likely, girl is not in flower yet.. Epsom salt works better, i would not use CalMag , when i miss only one part .. ( if you plan just to increase calmag, you are way off from proportions anyway, but i never liked how biobizz calmag behaves , so rethink before pouring a lot of it ...) Ussually its related to watering habbits in soil. Overwatering causes it very often , aka toots have no wet/dry cycle. No diary, hard to tell 4sure, but if firstly leaves went into tigery stripes and later necrosis appeared - 100% magnesium. If necrosis came up together with bleaching of leaf - phosphorus, lack of it.