Are these leaves turning yellow is normal in this ...

https://youtu.be/ZTE-YCNWC8s Maybe this vid will help out

Mites and pests in grow room even if in flower I would not spray a thing on plant try this works for me and I help few pals also smoke bombs for mites pests etc the ones you light not spray 1 st turn extract and intake off put in grow room light it go back in three hours put extract and intake back on 3rd day Do it next day again for any eggs that hatch And Repeat on 4th day You will have no nights pests or anything and does not effect plant any way good luck

Best guess is that the plant is under nourished. My experience is that underfeeding tends to lead to overwatering, which just ends up smothering the root system. If the grow media is too wet, carefully aerate it with a thin stick. Reduce the light level so that the plant is not exhausted by photosynthetic demands that cannot otherwise be met until the soil is sufficiently dried out to accept a richer feeding. Checking your soil pH would be advisable is case you are experiencing lockout.