You need to use nothing but water for several weeks.
They look fried from roots touching too strong concentration nutrients.
30%ffof 70%perlite
Imagine bath tub full of perlite, and only a gallon pot worth of potent soil in the middle somewhere, if you plant a tiny plant in the perlite, if this tiny plant's first roots come out and touch that potent soil too soon, fry. Cutting with perlite does not make what is in that soil any weaker. The soil does not release and distribute what is in it weakening its effect spreading it out more over the perlite. cutting it with other weaker soil would though, as the extra soil will take up the slack and balance out the entire mix, perlite will not, it does not contain humic matrix and has a very low cation exchange capacity. Soil has high cation exchange capacity.