The fan might have bloomed already and its only natural that it dies back, Some do remain for a time after blooming.
I think it should be cut as its no longer metabolizing any nutrients. In fact, almost looks as if you just tug on them they should peel right off and you can trim the stump up. Don't lop the fan out. Just remove the leaves.
As for the stump, sprinkle some cinnamon on it after the leaves have been removed. A small Dab of Elmers glue and cinnamon make a good antibacti-paste.
You will enjoy the Paphs as they are pretty tough little plants.The humidity you have and the not to bright light it loves. Always more Air. I even go breathe on mine some cus they need C02
Once a week water might not be enough if the media is drying out. I have about the same humidity at about 65 to 80 degrees and mine need water 3 times a week, with one weakly weekly fertilizer treatment. Whatever you use on the other orchids is fine for the paphs. Just not too much..All our homes are different (Doh!), but Don't let it dry out. Dry roots start to pick up salts and minerals and that burns them.
You should have some bloom in march/april maybe on that one. I'm thinking to borrow a line from Bill Asia "can flower if environmental conditions are favorable for the plant."
I learned all that here at OrchidBoard
So I hope I help someone
maybe?