Yellowing of some leave from inside out

This has happened a couple of plant 2 _3 weeks into flowering pH 6.8 hum 40%temp 28c defiency?? Only on some flowers yellowing from forming cola out yellowing clear border with green some heads totally green any advice greatly appreciated

Photos in natural ight please mate, and the strain.


much more info and pics would be helpful,

maybe this will help…

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