It looks like it has been in that pot a long time, and the medium is breaking down. I suggest you not water until the medium dries completely, in preparation for repotting.
Do a little reading to see what is involved, and plan on repotting as soon as you can get the materials together. It will probably be fine in that pot, with new medium, after you wash the pot.
Read a few pages in a sticky thread here. From the left yellow menu choose Forums then Beginners. Near the top is the sticky thread The Phal. abuse ends here.
One other thing - when you repot, don't cut off any roots. It's very hard to tell whether they're really dead. You will find many videos online telling you to cut roots, but I think you shouldn't.
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