Some might recomend a higher humitity, but I doubt that this would be the overall problem, and as for the picks, vision isn't good enough to see them. I have read your other thread and I am alufe to the reason for the stop of growth. How far away do you keep the lights? and do you have a perlite cut in the soil?
I would try to get better control of the PH instead of just letting it go where it wants.
Adieu