thanks a lot for the reply!
The root color change is also my guess. I will continue to monitor.
In terms of the flow/setup/airflow, I have a mister (similar to a standard home humidifier but with slighter bigger water droplets) running for 15 mins each hour, and with a fan running for 16 mins to get rid of the excess humidity.
overall RH goes up to 92% after the
misting, and then drops to 80-81% RH before the next
misting. It is high, so thats why I decided to go bare-roots for them.
I have a full spectrum grow light with around 1500-1600 FC, so it shouldn't be anywhere strong, but I get the root transition point.
Tannin bleach - as this specimen is now mounted on a driftwood ( which was supposed to be used for aquariums). I heard the wood might bleach acidic tannins to make roots darker color. Mostly benign.
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