Pic is pretty blurry but it looks burned. Move your lights a little further away if thats whats doing it. How do you know your roots aren't developing? And at a week old there wont be a lot of roots to show, atleast not in my experience... Mine are about 2 weeks old and im just now seeing the roots hit the edge of the cup they are in...but as long as your plant is growing, you can bet those roots are too. Just might not be able to see them right now.