Originally Posted by low_and_slow
Mg is locked out probably, as new growth develops the plant strips it from the lower leaves and you get those spots. Are you measuring the strength of your nutrients with a meter?
no , I started feeding by 1 drop of each nutrients when plant was little seedling and started as plant grow , These spots happen after I topped plant and flushed coco with 5.5 ph after this I saw these spots ,
I just flushed plant recently with 20 gallon of 5.5 ph ,today I watered with ph of 5.9 and 1 ml of calcium magnesium for each gallon .