Deficiency?

Over fed..........not under fed.

That could be caused by excessive heat or lack of humidity, if you're sure that it's not these things, then try dialing back on the feed and see if that makes a difference , make sure you don't feed in every watering, like after every 3 feeds give them one just PhD water

depends on what's and how's often ur feeding answer for coco👇 growdiaries.com/grow-questions/88416-2-week-old

hey 👋 It looks like a magnesium deficiency; if you’re sure about your pH, then either you need to add Mg using CalMag or Epsom salt, or you’re giving too much Ca or P, which is blocking the magnesium