My sour diesels are in their 8th vegetative week. They were planted in the ocean mix from fox farms. They only get phd water and cal mag. I can’t tell if this is a sign of nutrient burns or some deficiency. It’s only happened to the four lower leaves.
After 8 weeks your girls need food. Probably magnesium deficiency from what I see here. I’m no pro though so wait for others.
Edit: probably not magnesium if you’re giving calmag.
It looks like a deficiency to me i just cant remeber which one though .i just had a look on YouTube it looks like a potassium deficiency boost ur potassium,get some banana skins and cucumber skins and make a tea for ur plant both the banana skins and cucumber skins have potassium and phosphorus in them put the skins into a ten ltr bucket fill with ph water and bubble it with a air pump for 24-30 hours then give to ur plant
Quick Visual Guide to Nutrient Deficiencies in Cannabis - YouTube have a look at this YouTube channel
Give her a good feed if you haven’t already.