My best advice
1) soak them in the bath tub for 20 min
2) flush with 2 timex soil volume with pH'ed water!!!
3) then give them some 1/4 strength ferts

I think you have a pH problem, assuming your using good nutes
harris7 Reviewed by harris7 on . is this root rot? http://gallery.cannabis.com/data/2/medium/root_rot.jpg Rating: 5