Spots on Leafs



hello, I wonder what could be the reason…
pH: 6.7
soil: plagron bat mix, plagron worm casting, plagron lightmix and plagron growmix
the plant is 8 weeks old.
the light I use is Lumatek ZEUS 600W PRO 2.9 µmol/J…currently it is at 50% and 50cm away from the plant. 18/6.
Temp is from 18°C (when lights are off) to 23°c
the humidity is 45%
She is autoflower

Looks likeva touch of nute burn. Back off your feed a little.

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