Nutrient Deficiency or Nutrient Lockout? Week 4 Veg, Aeroponic System (EC 1.8, pH 6.05)

Hi everyone,

I'm looking for some opinions on whether this plant is showing signs of a nutrient deficiency or a nutrient lockout.

Grow details:

• Week 4 of vegetative growth
• High-pressure aeroponic system
• EC: 1.8 mS/cm
• pH: 6.05
• Reservoir temperature: 20
• Air temperature: 24-26
• Relative humidity: 60%
• Nutrient line: A+B+C components

I've attached photos of the plant.

Given that the pH is stable at 6.05 and the EC is 1.8, do you think this looks like an actual nutrient deficiency, or more like a nutrient uptake issue/lockout?

Any thoughts on which nutrient(s) might be involved, whether this could be caused by excess nutrients, root zone issues, or nutrient antagonism would be greatly appreciated.

Thanks in advance for any insights.