HELP PLEASE brown and yellow leaf tips and some curling up

 
 

HI i am 2 weeks into my grow and have checked them today and they have brown and yellow tips and some have curled up PLEASE HELP.My grow tent is 1.2mx1.2m with a 600w hps room temp stays around 30 celcius light is about 3-3.5 feet away from top of plant i have 10 plants and only a couple of them have developed this the rest are looking amazing.I have not added any nuts but the soil i am using has added john innes

The plants are wet as i just sprayed them with water.
PLEASE SOMEONE HELP
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