@phytokind
You taking the piss or what, where the hell did you learn about growth in plants. If i was you go back to google and actually read up on plant growth. Especially for cannabis, cause you dont seem to know what your talking about.

That plant looks fine and its not dying.
A lot of cannabis plants tend to start yellow as there new leafs come through and become darker.
Try moving the lights away to about 2" and not 1" as it does seem a bit close to the top of the plant.
As for not using MG, you can use MG. The best MG to use is MG all purpose, its NPK is 26-8-16. But dont start using nutes untill at least a month old and also if you do use MG use a dilluted solution not full strengh.