Blue fungus on Phal. roots

[lightrain21]

Hi!

I have had a phal for about 3 years. In the last few months it has put out a lot of new leaves. Then all of a sudden about a month ago it started yellowing and dropping leaves. I had posted in the phal abuse thread about this and several people suggested it was crown rot or root rot. I poured hydrogen peroxide down the crownand also purchased a new potting medium. The medium is a mix of lava rock, bark and moss. It has now stopped dropping leaves and I have 4 left. It has been okay for about 2 weeks but I just went to check on the roots and found that there is now teal-blue and white mold or fungus growing on some of the roots

It definitely was not crown rot that caused the leaf loss.The phal has lost a lot of its healthy roots from what it was at a few months ago. I think I must have under or over watered the roots causing many to die, so the plant dropped leaves because it no longer had enough roots to support that many. I did not see any fungus when I repotted it in the new medium, and I sprinkled on some cinnamon as I read on a thread that it has some natural fungicidal properties and I don't have the funds to go buy an expensive fungicide.

I have cut off the visibly molding roots, and am basically left with all my aerial roots. I have three questions:

1. The bottom tip of the main central root that all the other roots come out of has some fungus webbing. Should I be cutting this part off as well? I don't want to leave the fungus, but I would imagine it would be quite traumatic to the plant to cut part of this off.

2. Any natural or cheap household products I can use on the roots so I don't have to buy a large expensive bottle of something? I read in some forums about listerine. Will pouring hydrogen peroxide on it work?

3. How should I proceed in repotting and watering? I don't want to put it back in the new medium that I suspect the mold came from. I still have the old medium it came in that it never got mold from. Is it okay if I leave the plant out of a medium for awhile and mist it occasionally with water to better monitor the fungus situation?

Thank you for any help you can provide!