Plants dying at tops of nodes/new growth

About 2-3 weeks ago I noticed my plants having a strange curling and paling of the leaves. It progressively worsened and I showed a picture to another caregiver and he said root burn from to low ph. Few questions I have are; is he correct? are they worth saving? Any help is appreciated.death plant.jpgdeathplant2.jpg
 
That looks exactly some Mold issues I had with a handful of new clones that I clipped. They had a little black mold settle in on their growth chutes and parts of the growth turned that Yellow discoloring, and those new leaves were spindly and crispy.. I separated them from the group, overcame the mold issue, then cupped em, nuted em, and they came back very well.
 
Not good bro . This is a rotting/stressed root system issue. The new growth is indicating death is near. What happened were they overwatered? rootbound? badly transplanted? Get them out of the pot to check the health of the roots you can see.
 
It is much worse then you think. They did have some rootbound issues but it started with my large plants in veg and not the clones or root bound clones. Then it spread and it doesnt seem to stop. I have dealt with mites and fungal gnats but my beneficials keep them at bay. I started using a beneficial called Vortex compost tea as a foliar and they showed some improvement only to have it decline again. The fungus treatment I used was Bonide Infuse
 
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