Dancing with the Devil in pale LED light

The reason your seedling is growing so slowly is your temperatures and humidity are too low. Cause ing LVPD (Leaf vapor pressure deficit) This imbalance affects your seedlings ability to effectively pull nutrients through it's root system. Try to increase your temperatures to 77-78 with 60 to 65% humidity. Typically you should start your auto flower seeds in their final pot size they do not like to be moved.If left in small pot too long she will be stunted. Even though they are in larger pots you would water then like you were growing them in solo cups until they have,a large enough root system check out my current grows week 2 gives an explaination of LVPD with some links for more info. You can see my stategy for starting and watering auto flowers. Over watering can also cause nutrient absorption issues. Feel free to message me anytime. Hope this helps.