Og kush 39 days flower

Hello everyone here is my og kush from royal queen of seeds day 39 flower, my question is do the og leaf curl upwards due to strain or is there a minor problem? Like salt build up or some kind of deficiency? Only my 2nd grow....... don't think it's temp, indoors 27 degrees light on and light off is 18, 1 plant under 1200 watts, 6 inch extractor and 4 inch intake.
Anyone got experience with og? Cheers
 

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