How old is that plant? You shouldn't give a plant any nutes until its atleast 3 weeks old or the 4th or 5 node,,There is enough stuff in the soil for the seedling to grow. when you do start adding nutes start at 1/4 strength and work your way up to full strength. If you do this you will have greener leafs and stuff. That plant doesn't look like its very old. Maybe start another one, So you can see the difference.

kd_special