If your PH is correct.
That is a Nitrogen Deficiency.
Can you post what nutes you are using and what they state they contain nutrient wise.
And also, They say no ph needed. I have seen many nutes say this but you still need to check it. Your water varies from time to time as well as the nutes you are adding. You always need to check.
Also your soil changes during a grow. Especially if you start killing off microbes somehow. Alsways check PH.
Just posted this in another section but it is a helpful graph.
View attachment 2888531