I haven't fed a lot of nutts. Just feed once to be real and I didn't even feed what the bottle said I went way under that. And the lights I have are not strong at all. It's only pulling 65 actual watts. I was planning on getting another light instead because I felt that was way to low.You're killing it with Too much light, too many nutrients and over watering. At this point you might want to consider starting over and tossing this one into the learning bin. Next time try not to kill em again with too much light too many nutrients and over watering.
You should prolly use the first lights you were using before the LED and leave the LED for later when you're plants are much bigger, for the first 30 days from seed the first lights are plenty. If you must use the LED you're gonna need to raise it really high above the tiny seedlings like 4 feet.
If you continue to use soil with nutrients already in the soil you don't need to add more nutrients and over feed and kill your plants, you can probably get two months out of that bag of soil with small plants like that before you have to worry about having to add more nutrients because the plant got so big that it ate all the food in the bag.
And the over watering problem is easy to fix, water when the plant wants to be watered and not when you feel like it, lift the container the plant is growing in and if it feel light with no water than water it, and it should be once a week if you're in the right size container, if you're having to water more than once a week you need to repot to a bigger container.
If you can do those three things you're gonna be successful good luck young Skywalker.