I think of the leaves of a plants he Thanks MMG. I think of the leaves of a plants as a plant's "head", but maybe the roots are the head??? WOW, Paradigm shift! Anyhow like you say my temp has been a problem and maybe the led light, a gift so I know nothing about it, is not good for seedlings. I think I have to raise the babies up higher than the heater because the heat isn't getting to them. I just did that and I put them under halides to get more heat and better color light. Maybe I'll post a pic. Happy new year everyone!