Thanks for the pep-talk and info.
Last night I unpotted the plant, washed it, performed radical surgery and cut away anything that was obviously rotting, looked like it was rotting or was soft/spungy. I have 2 pieces of crown with some roots attached remaining. I dusted them in comet and left them to dry. I picked up some bleach this morning and have the pieces soaking now.
I think it came in with the plant (and I contacted the seller so that she could treat her plant) because this was potted in fresh ProMix in a new pot and all the other plants that were potted at the same time in the same media are fine. In fact most of them are growing. I've only had the plant for a month as well.
The seller told me she would ship me a new fan in the spring, which I was shocked at and did not expect, so I will take her up on that if I can't raise one of these from the ICU.
