P L E A S E HELP my plant !!!

12 days from seed - 4400w hps lihgt - what are those yellow-white spots???? pls help!!!

iron definacy maybe check this https://www.rollitup.org/marijuana-plant-problems/38772-guide-diagnosing-plant-problems.html

maybe some wrong ph, do you check it? or tap water with lots off chlorine!
dunno what else could it be
good luck