HELP! i need help diagnosing my cannabis plants!

I'm a beginning grower and im lost, my plants have not been fed except what is in the soil. I used mircle grow 6 month feed, yes I realized shortly after that was a bad move. I have sense transplanted them into much better local made soil with composted forest products, composted arbor fines, composted chicken manure, iron sulfate, worm castings, dolomite lime,ouyster shell lime,bat guano and kelp meal. Now I'm not sure what was in the "miracle NO" soil, my plants At first i had them out in the open behind my chair with a reflected CFL light now they are in a tent with a 300 watt LED on them 78 degrees and 60 humidity. I have not fed my plants anything but I am seeing small nute burns make there way all over the leafs and one plant that shows less nute burns the leafs are getting a purple to black color on It, They are about both about 2 months old and way to small. I can't get the nute burns to stop from spreading and also some leafs show nitrogen toxcity i think tips curl down and there darker green and my stems seems to be turning dark purple will this destroy everything? My plants don't seem happy Please help me to get to first harvest, i can upload any further pictures anyone may need to help

How close is the 300w LED to the plant? What kind of air flow in the tent? How often are you watering? Do you ph the water? That's what I would look at first. Plant will go through a little shock after transplant, but should bounce back in a week or two.

Iv tested the PH in the soil and it was a little alkaline so iv put sulfer in the soil but I need something more fast acting because I think the ph lvl prevented phosphorus from getting to the plant and I could have a deffiency. But the LED are about 8 inches away from the plants. I wager not very often when i feel the soil is dry before I was over watering but have sense been monitoring close

Here's what I would do: Raise the lights to 16-20 inches. Water once a week, until the soil is dry (pick up the container, should be light before next watering). Ph the water you use to 6.7-7.0, always water with this. Ventilation: passive intake (twice the size of your exhaust), 4"-6" outlet fan, also a small circular fan blowing across the canopy. I wouldn't feed for a month with that new soil, or put anything else in the soil. Good luck with your grow! Peace

Awesome man thank you that gives me a good running start to get this all in check

IMO is a drainage issue, I don't see any perlite in your pots.

perlite would help, my soil has wood chips and such in it and and forest floor compost, should i add perlite? the soil always seems to be moist even when i dont water for a week

Wow them plants have dark purple stems and the leaves look pale in colour.
They need nutes my friend