Neofinetia falcata had white mold on roots

[pinkowl]

My Neofinetia falcatas are in need of care. I noticed one of my plants getting sickly so I ended up checking all my plants and they have white mold on roots. I have taken everyone out of their containers and soaked in hydrogen peroxide and placed back into their terrarium on paper towels with bare roots at 50+% humidity. Many of the roots look bad and I need to get some isopropyl alcohol (to clean cutting tool) so I can remove what needs to go.

I was thinking of getting a product like KelpMax to help them regrow roots, but a liter is way too much for my own needs. Is there something else I can use to help them along? Any advice on what to do next? Would it be bad to soak them again in hydrogen peroxide after I remove the bad roots?

Help me save my little ones.