Need some help, brown spots

Question from a fellow grower:

Message : Hello I received the seeds and they all sprouted, tomorrow makes 3 weeks and on a few of them I’m noticing small brown marks at the tips, one is growing a little twisted and on one theres a small brown circle. Should I be alarmed? I uploaded a Pic for you to see, thank you I have other pics as well if you need me to send gem in.

  • Strain: blueberry, purple Kush, purple tw
  • Type (fem/auto/reg): fem
  • Climate (indoor/outdoor): in
  • Medium (soil/hydro/details): coco/perlite mix
  • pH of runoff or solution in reservoir: 6.2
  • Nutrient mix strength (EC/TDS): n/a
  • Light type & schedule: 18/6
  • Temperatures day & night: 70 night, 82 lights on
  • Humidity day & night: 40 night, 50-70 lights on
  • Ventilation:
  • AC: mini split
  • Humidifier: no
  • De-humidifier: no
  • Co2: no

Hey there, welcome to the forum.
Do you have a picture in natural light? The purple makes it difficult to tell whats happening.

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Possibly just a burn from a water droplet on plant. When watering try not to get water drops on leaves as the light will be magnified and burn the leaf.

If you zoom in, it doesn’t look like water on the leaves. In the blurple light it kind of reminds me Cal-mag deficiency.

That’s to high for coco. You wanna be at 5.8