Yellowing Fan leaves?

Hello everyone just wondering if anyone can give me any advice on whats causing this. My PH is a little High I believe. Nutrients are calmag, fox farms Big bloom and fert. I also used some Nitro supp eariler this week because I thought maybe it was low.

These are Autos on week 12. Happy frog soil.

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From the photo, it appears that the affected leaves are older leaves that the plant no longer needs. This is a common occurrence as the plant matures into flowering.

Overall, the plant looks healthy.

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It’s normal to have older fan leaves drop off later in your grow. The rest of the plant looks pretty healthy.