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Yellow leaves at top of plants

Hi guys could you help me out identifying whats wrong with my grow ? I have yellow leaves mainly at the top of the plants, some have tip burn others dont.  Im thinking its a Nitrogen deficiency but not sure if its nutrient burn/lockout ?


I am growing in AutoPots and have been easy on the feeding, the strain is Blue Dream Auto from FastBuds










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Nitrogen deficiency usually starts at the bottom and works up ... although that does look like N deficiency ... 

I use mud so cannot really offer any advice other than say they are looking hungry ... how are your temps ? 

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Temps at 23 humidity 50% Just tested water PH was at 7.8 think that might have something to do with it !

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