Blue green spots on dendrobium roots and now Phal?? (Mold???)

[Nails]

Hello! This will be my first post on this forum. I hope I’m not repeating something that’s been answered elsewhere (I did try the search engine!)

Until recently I’ve only had phals, but in August I bought my first dendrobium and noticed there were blue-green spots on the aerial roots....although at the time I thought it must be some kind of paint or dye from the store.

On Sunday, I repotted my dendrobium and a Phal. I noticed that the blueish spots were also on the roots in medium and it seemed to me that those areas that had the spots were mushy, so I removed any affected roots. I sprayed the roots with hydrogen peroxide.....which I know is not ideal, but I haven’t been able to find any fungicide in my area yet, and I thought it would be better than nothing.

The next day, my Phal had two of the same blueish spots. I’ve attached pictures of the spots on the Phal roots (dendrobium aerial roots look okay so far)

Does anyone know what this is and what I can do about it?