OG Kush Feminized First Grow #2

The leaves look like a cal mag issue. AN site says to use 2ml/L. Also I don't know what kind of soil you are using, but lots of soils have tons of calcium and magnesium in them to begin with. probably locked your roots out if this is the case. Cal-mag is generally used for coco coir and hydro setups. solution: flush and rewater with new nutrients. hope this helps.

Nice one mate !