Quote Originally Posted by bitemybud
Sounds like over fertilization. Dried twisted leaves are the product of too strong a nutrient solution.

Soilless is like hydro...No soil. ph should be closer to 6.0

Good Luck.
Sorry , I forgot to mention. Best thing is to flush thoroughly with ph 6.0 water. you need to use 3 x's the capacity of your pots. 3 gallon pot = 9 gallons of water to flush. After a couple days when soil dries out a bit add nutrients again...maybe about 800ppm.

Hard to say at this point whether they will recover or not.