Yellow edges on small seedlings, soil-less mix, 3 weeks old.

Okay heres the terrible update... I really hope someone can help me... I feel like i'm going to lose them and thats like 100 dollars in seeds.. Please someone... I would like to add that the second picture and the last picture were the two little girls that were looking so good last time. Wtf am i doing wrong here... Could this all be due to high temps? I have never had plants grow this slow, they have been pretty stunted since they first sprouted and i dont understand it at all. The temps have not been THAT high, I'm really fucking confused. I feel like it has to do with the huge pots maybe? Idk

Okay well i just went and retransplanted them into smaller pots, And while i have been transplanting i have noticed how weak the roots on these girls are. The roots basically on all of them has just been a lone stringy main root with very few and strangly roots coming off it. How can i improve my root systems? I have rooting concentrate and i have superthrive, i have all kind of crazy nutes but i don't want to use anything else on them, i just want to give them plain water for a little while and see if that helps things.

ok they are a lot smaller then i thought they dont even have a true set of fan leaves... yeah stick to water till they're bigger. only water when they need it

I wouldnt add nothing to them till growth looks good, like above just plain water and pray to the great ganga god!lol!

Seriously though it looks like too much ferts and too hot soil all through the grow. Why else would seedlings stunt and burn like that.

I understand you dont want to overwater them so just hope for the best as they are is all i can say but i'd bet my two cents that this was the main almost only problem here. If it was the problem will take a while to reverse.

I seen that sunshine mix number 4, isnt it meant to have very little almost no ferts in to start with? Peace