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Organic808
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seem to be killing / stunting fresh clones too. The pics are of 4 week old plants. There is black mold growing on some parts of this grow room walls too.how old are the plants?
you could dip the cubes in nitrogen peroxide dilution and see how the roots/medium react.
while you are doing that you need to sulfur burn the room. You can not skip this step. you have a fungal pathogen so your in it to win it now.
I dont think it could hurt to dip the cubes/root ball into a liquid copper fungicide. thats what i would do.
oh yeah, reason i was asking if plants were young you could sulfer burn with them in the room. I would not do this past 2nd week of flower.
best of luck