I see several things.
1. Over fertilization.....don't give any more nutes.
2. Incoming pH too high. Use molasses (unsulphered) to lower. CHECK PH EVERY WATERING.
3. Rocks in bottom of pot, no good. Next time use pots sized to plant and let them grow into them. As you repot this adds new mix and essentially fertilizer.
4. If it is still moist on top, you may be overwatering.

Again, pH can vary greatly in just one day. Check every time.
WashougalWonder Reviewed by WashougalWonder on . Yellow crispy fan leaves on 4 different strains.Deficiency or hard water? Hello people.It's been about 10 days I have this problem and it seems it's getting worst gradually.I'm growing 4 different strains:Masterkush, Super Silver Haze, Ice Cream and Blue Cheese. Here are some pictures: 279005 279006 And the most affected plant, masterkush: 279007 Rating: 5