Royal Queen Seeds - Only

These ladies are growing in good health but I think they have some nutrient deficiency because the fan leaves are yellow. I also think I’m going to apply some training on them because they’re growing not so tall and I would like to make them bigger for bigger yield. QUESTIONS: 1. It happened to you guys to have your photoperiodic strains with their fan leaves yellow? Do you know which deficiency could be? 2. Any recommendations about which training should I do on them? I’m thinking about LST :) Thank you so much!!!!