First, are you letting the pots dry out some? It may be over watering, about the most common cause of stunted plants. If that may be, let it dry till you see the first signs of will then water. I've saved a few this way. What are your temps like? Get your space up to 75-80F for a few days, that can help also. And raise the light high for a few days, make em stretch a bit, then lower it again. Other than this, not much I can think of.