Miracle Gro soil has fertilizer in it.
Miracle Gro fertilizer is WAY too strong and harsh for seedlings.
Your plant, having only 4 nodes, may technically still be considered a seedling.
Never fertilize before 5 nodes.
It's lucky you are not growing a light feeding sativa or it would be straight up dead by now.
Also you did not answer your lighting question.
You NEED ventilation or you will suffocate the plant.
Why is your lighting on random?
Why can't you ventilate your grow?

With all the stressors and problems, you might want to reconsider growing until you can build a proper grow chamber with a real exhaust and real lights.

Seriously, read throuhg the grow guide in my sig.