Yellowing leaves, brown tips. brown dots 4week old NL

So I've gone through the forums and seen some with the same problems but I wanted to confirm. I'm growing Northern Lights it's around 4 weeks old from seed. The leaves are YELLOWING at the bottom and browning at the tips. Recently though it started browning at areas other than the tips. I'm using 15-3-3 nutes once a week in a small pot. Growing with 6500k CFLs and 80 degrees Fahrenheit. PH 6.7 water.The major problem is that i'm using Miracle Grow 15-7-5 or something close to that. At first I thought it was a over watering so i stopped for a bit and that didn't help. Then i thought it was nutrients deficient so I got nutes but that didn't work. The problem used to be controllable but now it has spread. The new leaves seem to lack chlorophyll and the older leaves are just dying off turning yellow then dry brown. I WANT to switch to fox farm soil, but I want to confirm if this is the problem and how to solve it? Can i transplant into another soil or what can I do?

Thanks
Mr. Rager



The first picture is the plant earlier this week on Monday.

nute burn you prolly dont have to flush it it can prolly recover on its own

is it miracle grow soil also?

yeap miracle grow.

Looks like nute burn...should recover. Less is more when it comes to fertilizer/ganja. We do some stupid things sometimes. I sprouted 6 Marley's Collies in a Miricle Grow mix, and like some moron didnt read the label. Didnt know the mix had long lasting ferts, anyway Im kicking myself for stupidity.
Marley's are starting to recover (23 days old and still an inch) but looks like they are growing out of the mix and getting color back.
On the other hand the White Widows I planted at same time are tree stalks, 4" and ready to veg.

I know what Im doing that's the kicker...I knew better. I think my only option is transplant...I will give it a few days.