Grey/brown spots spreading on leaves

Mr green grinch

New Member
Hey guys need some help please !
About one week into flowering with Pineapple Express autos and have notice some grey like brownish spots spreading on some fan leaves , they on 3/4 nutes strength 3 15 min feeds in 24 hour grown in coco. Ph has been sitting around 5.8 upto 6.6 , after some advice on what this is and how to fix please and thank you . Also just to note this is my first time grow
 

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