Yellowing at 3week of flower quick critical+

Hey guyz whazz up hope all good.
My girls are in 3WEEK today and i see some yellowing in the leaves young and old ones temps are 23-25c moisture is about 40-45%
Using advanced nutrients combo ph pefrect and watering 2 times a week.Led light 1200w 45-50cm above the plants.
And sorry about the light.:)
 

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