New Grower Cannabis Seedling Issue

[Sama00646]

I'm having a bit of trouble with this plant. We have three others planted, two of which have been growing phenomenally, and another of which is doing good. This little gal here seems to be suffering though and I can't figure out what to do about it.
We have the humidity and temperature monitored, and I'm sure it's not a watering issue. I plan on getting a PH meter tomorrow to check soil levels, but I'm worried the problem is my soil. We got seedling soil with miracle grow in it without realizing you dont really want to use miracle grow. I was researching what could be wrong with the plant and that seemed to maybe be the culprit? If so, is the plant too young to transplant safely? Any help is appreciated!

 

[Madbud]

Its not the soil, i’ve used mg seedling starter very successfully for 2 years. What’s the light source and distance?

 

[Sama00646]

Its not the soil, i’ve used mg seedling starter very successfully for 2 years. What’s the light source and distance?

Its 1000w LED hanging about 20 inches above the plants

 

[Madbud]

Its 1000w LED hanging about 20 inches above the plants

I’m guessing that’s too much, especially at 18/6. The seedling feeds primarily off the dicot , which looks healthy. Can you cover it with a screen for a couple days?