Is this mold on phal roots?

[vanillacreme]

I have noticed white fuzz on some of the roots inside my recently repotted phal (Jan.13th). The fuzz seems to be on the roots which I decided to keep on the plant, although some of them were broken but still firm and/or had rotted areas, but continued on with healthy extensions. I am not sure if I need to repot again so I can entirely cut off these moldy roots, disinfect the remaining roots with H202 and clean the pot/media again. I do not want to stress out the plant further, but the white fuzz is worrisome. Currently, the leaves look good, but one of the aerial roots is shriveling up. I have also noticed that some of the roots are starting to turn brown. I have been careful to let the roots dry out before watering.

The pot is placed near a west facing window in the main bathroom (somewhat humid). The current media is medium bark mix with charcoal, sponge rock and some spagnum moss. I believe the phal is also getting used to it's new media as it originally was potted in pure moss, making the roots currently not so happy.

Here are photos of the white fuzz through the pot.

Your advice is greatly appreciated. Thanks!