Speckle on leaf

Pot size : 19Lt
Ph :6.4
temperature: 83’F
23 plant
5 x600 HPS light
Flower 6
moisture: %42

fertilizer: Advanced nutriens
Micro , bloom,Grow
Big bud, sensizm ,owerdrive , cal mag
I wash them and also flush them and result ı am so upset pleAse any body hepl me
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Looks like you have several things going on there. Lack of Calcium looks like one of them.

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Thank you

Are there any pests under the leaves?
In the picture where the leaf tips are curling up, that could be possibly too high temps? What is yours running at? What’s your RH?