Leaves yellowing

Hello brothers, this is my first grow.
white widow and critical will go for outdoor later.
15 days old,
they are growing in rich ecological soil with lot of vitamins and microelements, + little bit humuss , and some 20-30 % perlite.
humidity 50-70%
light cycle is the same like outdoors ,
i did make post couple days ago , then those leaves was not that bad , but now they look horroble ,
from 20 plants there is like 6 plants who look like this ..
 

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