yeh bro give them a good flush with distilled water .this curling up of the leaves can be caused by giving nutes to earlie i had this happen to me and after i flushed they were fine.I dont know if you use water straight from the tap as this can cause this prob to .i have to 30 litre containers the i fill with boiled water and leave sitting for 48 hours before i use it once you get into the routine of doing this it works fine as soon as one container is empty i fill it again and while thats sitting for 48 hours i use the other one vice versa.anyway looking damn good as usual later bro .the postman.