I can't figure out what cause this...
Here the setup:
aeroflo
EC 1.1 mS/cm
ph 5.2~5.8 (set it to 5.8 and let it drift to 5.2 then adjust again)
ghe flora nutes npk ratio 3-2-1 + epsom salts
600w MH 18/6h
the plant is a slh (ghs) 6 weeks old from seed in veg state
closeup