ello first timer ! first things first, try not over wory, secondly how close is ya light to the plant coz it looks like heat stress, 30c aint the end of the world but u do av to make sure that 600 watter uve got aint to close, now if that aint it then ur gonna av to do a little research to see what them symptoms maybe? av u got any fresh air coming in ? do u check ur ph before u water ? as ph inballance can all kinds of adverse affects,, i find best to do ur own research and then throw it out into the forums what u think it is and let peeps say yes or no! but gettin the right answer here aint always that easy, so u ur self need to use a lot of common sense do ur research and then with all the info u av then try and make a diagnosis! coz peeps like me sayin it looks like this or it looks like the other is far from the answer u want, as someone told me what i am telling you!! and it makes sense to learn fast as ya can but it is a learning curve ur first grow anyway and u shud not exspect any gr8 results from this first attempt, but saying that ur not just growing for the fun of it and u will want some decent bud at the end of the grow. good look to ya man and i hope u get it sorted but stick in there coz when it all comes together u will be a happy stoned chappy , lol. peace !