LEAVES CURLING AND DISCOLORATION

I have a few ladies under a 600w mh the leaves are curling and splitting also new growth is lime green alot lighter then the rest. Water is phd at 6.5 and I've used calmag plus on the last few feedings.

new growth being green means iron deficiency look it up. Curling depends in which direction could be under watering or heat stroke or PH problems or magnesium problems or over fertilizing get a picture up.

maybe mag def.

Like smokebomb420 said, pics please!... could be numerous things..