Why do some of these leafs have a yellow tint ????? Pics Inside

My buddy called me 4 days ago telling me that 4 of my girls are looking weird . Theres still looking like this what do you think this is from ?
The room is at 75 55% humidity. The girls leaves are pointed upwards also and they say thats a sign of happy Right ?

automatic himalaya blue diesel , 21days old , 1.5gal FFOF / 30% perlite , 400HPS Air Cooled ,



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Have you given them any nutes? if so, what kind/s and at what concentration? and how old are infected plants?

SLB

There 21days old , the other girls are doing great. These 4-5 just look like this . No Nutes yet but will be getting it on the next watering.

If the temps are good,airflow,it might just be ph,or mag problem.Add some gardenlime,if the mix did'nt have any in it.I like the espoma gardenlime.

It's kind of hard to "really" see and diagnose the problem with the hps on, you think u can snap a pic or 2 in natural light?

SLB

So many causes of leaves yellowing !!!

Ill toss a pic up asap . The girls looks healthy and happy . The leafs are just weird in color . I was thinking maybe its a different strain or something cause there the only 4 that look like that out of my other girls. There all in the same soil and these ones aint directly under the light , there more off to the side but light is getting to them perfectly just not right under the light like some of the other girls. There right next to the fan also getting cooled 24/7 and temps are 80 / 55hum. Today

Hi - any possibility that the soil ph is off?

ya , I thought that to but my probe is broke on my reader , so i got to go get a new one