Yellow leaves in a middle of flowering

Guys, thank you very much for your attention. But it looks like I figured out what the problem is. It's thrips! Does anyone have experience with these pests so far?

This is normal behavior considering your plant is halfway through flowering. But in your case is a lack of nutritious I will say raise the feed and make it 2.0-2.2 EC or from 1000 to 1100 ppm raising it slowly starting from 1000 and waiting 1 day if u don't see nutrition burn raise it to 1050 btw the PH keep it how is it don't let it go down lower then 5.5 and higher then 6.5 perfect from my opinion is 5.6-5.9 I hope this help enjoy 😎

Hola subiría el ph y ec algunos puntos. Ph entre 6 y 6.5 ya que en estos parámetros asimila mejor el potasio. Ppm entre 1000 y 1200 ya que tu planta está en la etapa de engorde y esta absorbiendo las reservas de potasio. Las hojas amarillas es carencias del mismo. Suerte