I planted 4 fruity chronic juice seeds in potting soil 10 days ago. Im using a Super HPS 400 watt, placed approximately 16inched above the tops of the seedlings. After 10 days it seems the rate of growth is lackin. They are each about 2-3 inches tall and developing their 2nd-3rd set of leaves. i have only been watering occasionally as i do not want to overwater. I have a fan constantly blowing and the temps are in the low 80s. How can i help to speed up the growth?