deficiency?

My guess is that your pH is too high, so that many nutrients can't be absorbed correctly.. If you had a Ph over 6 for long time, put some pH- and keep the res on 5/5.5 for a while...

Way too much Cal Mag. Ultra violet gave you the answer you need.

Too much of everything but what you actually need, Your using coir ferts for extra iron when your not even using coir, Cal mag is a high sodium fertilizer, also see your feeding silica and a bunch of carbs/enzymes. The equivalent of force feeding a baby a full turkey dinner with all the trimmings but you forgot the breast milk. NPK, CALCIUM, MAG, SULFUR. This form 99% of the nutrients your plant will need over its lifetime. Large percentage of that will be nitrogen. Only thing a plant needs until it's established is nitrogen.

Calmag is secondary nuts, primary it‘s Nitrogen / Phosphores / Kalium Your plants Lack Nitrogen