CBD Mexican Auto-flower second try

As the first 3 CBD Mexican auto-flower plants had not done well before putting them outside, I decided I had better try to do a better job of getting them started. That was not the first time to grow an auto-flower variety. Last year I had better plants but lots of issue with mold. I decided to try 2 different strains this year. I had 3 seeds left, one did not germinate. This time I am using larger pots. Using the same soil, Miracle Grow that has a little bit of nutrients included. So I have been in the habit of not giving any nutrients until the plans are well established. This time I have added a little bit of Advanced Nutrients' pH Perfect Grow in the water. Not much watering yet, 0 .75 liter just a splash at base of plants. The soil in pots had enough water in it to keep it moist so I did not need much. The LED I am using is equivalent to 600 watts and keeping it about a foot from top of the little plants. They also get some natural sunlight from a nearby window. I have been told that I need a stronger light if I want to finish a plant indoors. So I bought one, still in the box as the manufacture's web site has no suggestions as to light to plant distance.