Please provide more details about the grow so you can get better answers.
they look to be young and in coco but what nutrients are you using at what EC or PPM and what PH you running?
What type water you using RO or tap?
what is your environment like temps and RH and how far away is your lights and what type lights are you using and how intense are they set at?
I believed once you answer those the experts will be able to give you better answers.
They don’t look horrible but it does look like the start of something not good happening so the quicker you can get it corrected the quicker they will turn around for ya.