First off what type of lights and soil are you using. All ready i noticed that you could probably use alot more Perlite in your mix. Alot of soils strait out the bag is too dense to grow with, adding Perlite will make your soil drain better which in turn gives roots the space they need to grow and expand. I usually put about 25-30% Perlite in my soil mix. Also, If you only mixed up a weak solution of nutes to give them, i doubt that your experiencing nute burn. Peace out.