leaves curling

my leaves are green but the sides are curling up towards the middle. i have a 600watt hps about a metre above and an osilating fan and water them 200ml every second day. light stays on for 18 hours. what am i doing wrong?

what are your temps?

webb107 said:

what are your temps?

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i dont have a temperature gauge yet i will be gettin one soon

I have the same shit goin on. Do the leaves look like a rolled tounge. Well mine does and after researchin I came up with MG toxicty. Don't know how to fik it but would love to hear if sum1 knows

Pictures speak a million words....

first you should really have a Metal Halide instead of an HPS if youre in Veg cycle. (18hrs) how big is your setup? it may be that 600w is generating too much heat and you need a 400w , or you can get a strong enough exhaust fan that removes plenty of hot air (air cooled light too) your curling can be coming form them being too hot you just back off the light more and see it that helps, it could just fix it.

Without pictures I would guess that your 600hps is the problem.. To big a light for the veg cycle... Maybe try moving it as far away as possible... Knowing the temp will be a key element to you success... Peace