Thanks guys I'll give that a try. But recently it started perking up when I adjusted the PH. My PH was 6.0 in the res but when I check the run off it was higher. So I flushed the rockwool with 5.6-5.7 PH until both the res and the run off was the same.

Now the plant has picked up a bit and resumed growing. The older leaves are still F'd up but the new growth is looking good.