Got problems with blue dream

I recently bought Blue dream and I’m having problems which I’ve never had before. My plants are still young but 2 of them are with really yellow leaves. Did I do something wrong with this strain?

the plants could be sensitive to pH, what are they planted in, what are you pH’ing their water at?

what are you using for nutrients, how much have they been fed?

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They planted in coco. Give them 6.0 ±0.1 ph water with a little A and B. And root booster. They kept in 26-28" c .still on 18/6