Miracle grow and veg stage

alright, ive already made a prev post about yellowing leaves, some people said its because of nutes, i use zerooo.
then maybe the soil i use? its MG, no organic nothing like that. i recently re planted these kids with mg and since then ive notices problems.
i cant get foxfarm soil shipped to canada using amazon SOOOOO any suggestions? i was thinking of using just organic soil..but like i said i just repotted these guys from solo cups a few days ago...dont wanna stress them out. can i repot using different soil so the problem stops? ive never had this issue before....they are in their 1st week of veg stage, just finished seedling stage....so confused honestly any help would be amazingggggggg. thank you.

Firstly I doubt the soil is the problem, I assume you have another problem somewhere along the line. If you are seeing yellowing and you don't use nutes it COULD be your plants telling you it's time to start (among a host of other possible factors).

Personally I use Sunshine mix (Pro-mix or #4), excellent soilless mixture that I have never had issues with. You can find it at many garden centers, hell I think you can even buy it at Home Depot. It'll cost you about $37 /117L bale.

Even when growing in soil you should have a PH Meter.

That would be the first thing I checked.
Transplant into some soil OTHER than Miracle Grow.