Leaves curling up?

[masterg]

just a quick question, i was wondering why the leaves have started to curl up, the biggest 1 is a foot tall the other ones just about an inch or 2 smaller there on there sixth week in the veg stage. any comments are good, cheerz :)

[GTC21]

Are you growing in dirt or hydro? If you're growing in dirt have you used any fertilizer? If you have, what kind and how much?

[masterg]

i am growing in dirt, its miracle grow pottin soil, release plant food steadily, i havnt used any fertz on the 1 its happenng on the worst, the other ones i gave the wrong type of NPK to them.
cheers.