First attempt at this friends...................................Nutrient Burn or Calcium Deficiency in your expert opinion pleaseeeeeeeeeeeeeeeeeeeeee??
This is Feminine KAYA47 3 weeks after seed planted
Should have added that plant is in a 6 Litre pot of good potting soil and gets the recommended levels of Hesi Super ViT, Power Zyme, Root Complex and TNT Complex daily in 200ml water. Has been growing under 250W for 28 days now.
Most definitely looks like a calcium deficiency to me - get yourself some Cal-mag at your hydro shop and add 1-1.5 tsp per gallon to your waterings. If you're using RO water, I can almost guarantee it's a calcium deficiency since filtered water often removes most calcium that your plant needs...