Are yellow leaves normal?

Hi everyone, I have a nice grow going on my patio and it is my first attempt so I could not be more of a rookie. With that being said, if you look at my pics below you can see that my plants are growing really well and they are way into the flowering stage. Problem is; I am trimming a lot of yellow leaves as these plants mature. I don’t know if this is normal but I would appreciate some wisdom if anyone has any to offer.


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What strain, Seed bank, or bag seed

Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF

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PPM/TDS or EC of nutrient solution if applicable

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Co2; Yes, No

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It’s normal for a little yellowing. That’s just a little more than I’d want to see. They need more nitrogen, but filling out a support ticket will help us pinpoint.