Transplanted seedling suddenly turning brown

https://www.reddit.com/r/cannabiscultivation/comments/161lb0j/leaves_turning_black/?force_seo=1

Hypochlorous acid cleans roots from pathogens.

Pathogens are microorganisms or biological agents that can cause disease in a host organism. They include:
Bacteria: Single-celled organisms that can multiply rapidly and produce toxins.
Viruses: Non-living particles that invade and replicate within host cells.
Fungi: Eukaryotic organisms that can cause infections on the skin, nails, and respiratory system.
Protozoa: Microscopic, single-celled organisms that can cause infections in the digestive and circulatory systems.
Parasites: Larger organisms that live on or in a host and obtain nutrients from it.
Pathogens can spread through various means, such as contact with infected individuals, contaminated surfaces, or through the air.

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