Parasites

Looks like calmag deficiency to me. No parasites as far as i can see, no iron deficiency. If you work with LEDs i really would consider adding Calmag to your feeding schedule.

I can not see any evidence of insect or parasite damage/issues at all. To me it looks more like the start of an iron deficiency. A dose or three of a soluble trace element/trace mineral mix applied to the soil should solve the problem. Soluble trace element mixes should be available from any decent garden centre.

Look underneath the leaves. I use cheap microscope that connect to a phone to confirm. Normally, it is spider mite. It is treatable with miticide. Do not use insecticide. Before using check "pre-harvest interval". Weak but safe miticide is spinetoram. However, it takes four rounds of spraying (three days apart) to be effective. Then just leave it. The goal is to reduce the damage. It is better to be safe with less yield.