Rootless Phalaenopsis: Yellow Leaves at Base

[Dave_in_Nightvale]

Hello!!

I have a sick rootless Phalaenopsis that I have been trying to promote new root growth through water culture method.

Yesterday, I noticed the bottom leaf turning yellow and I thought nothing of it until today I picked up the cup it was sitting on (note: the stem was not submerged, just the lone root) and the yellow leaf fell off.

I know this is not normal behavior but I am having a hard time understanding the cause: is it stem rot, or is it because it is just too dehydrated to keep most of its leaves?

I have kept it in a watered cup for a few weeks with no success of new roots Or any growth

Notice how the two bottom leaves have a hint of yellow? I am suspecting that the cause is spreading...

I know stem rot spreads fast and in a few days the orchid will be dead so I will be using hydrogen peroxide-> dry the orchid after fizzes -> use cinnamon powder.

Will this help?

Edit: spelling errors