Propagation: Seeds sprouted but not growing, 2 by samthehavanese

samthehavanese wrote:
I started some tomato and pepper seeds and after a week the tomatoes sprouted and after 2 weeks the peppers. However, they are not growing any more and the tomatoes haven't gotten any true leaves yet. In fact, one has lost it's first leaves altogether and another has turned yellow. They're in commercial potting mix in peat pots under a grow light. I also have them on a heating pad set very low. They receive 16 hours of light per day. Any thoughts?