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Help identify marks on leaves, stunt grow

clash

New member
Hi,
I am growing second time in 2x2 tent. Having issues with slowed growing rate, and few flowers with little amount of pistles.
Days from germination: 45.
Strain: Auto Northern Light.
Light: 18/6. vipar xs1500 pro 50% dim.
Medium: 70% soil 30 % coco.
Water PH: In 6.0, runout around 7.5.
Trainig: LST.
Feeding: First 10 days watered with filtered RO water, no nutrients. After that started giving 25% of Tripart HW nutrients according to charts but with tap water with 200-300 PPM.

After the last feeding with full "preflower" dosage of Tripart HW but with 1L RO water, next day appeared light brown marks on foliage. Could it be cal mag deficeny or something else? Help these girls to have a nice harvest ;)
 

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