CHC Potting Medium & S/H

[scy]

I have a miltoniopsis and cymbidium potted in a terrestrial mix. I noticed that the terrestrial mix is not really drying out in the winter and would like to repot it in a different medium asap before root rot hits (if it hasn't already). Sphag does not work well in my growing conditions. It does not dry out fast enough and the temperature at night is 50 degrees F. I was thinking of using a combination of 2/3 bark mix, 1/3 medium coconut husk chips. I have no experience with coconut husk chips and welcome any advice on what would be ideal.

On a side note, I have a small phal that originally was potted in sphag. It had lots of new root growths (small nubs), so I decided to repot in semi-hydroponics. I presoaked / cleaned the medium well for a few days, soaked medium and roots in rooting hormone, and kept the phal on a heating pad to help stimulate root growth. However, the roots were still a healthy green but I noticed white fuzzy mold was growing only on the roots! I unpotted it and felt the roots to see if they were dying but they were still very firm and green. I rubbed off the mold, disinfected with physan (medium too) and tried again. Now the roots have pretty much died off except for one. I am thinking of repotting it to bark to save it unless anyone has a better suggestion on what to do. I know that semi-hydroponics is not always a sure thing and really dependent on conditions. I wanted to use this as a learning experience and figure out where I went wrong. My guess would be it was too cold even with the heating pad.