Leafe edge yellowig brown spots Help!!!

Autos Having yellow edges on some with brown dots
 

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Nutrient burn or ph imbalance .. what's your ph and what did you feed ? It did happen immediately after feed right ? What's your media?
 
soil ph is about 7, water them with ph down water-6ph, use organic fertilizer for grow 3-1-6 2.5ml/10 litre and bloom 2-3-4 2.5ml/10l
temps are around 20 degreese celsius
 
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