Hi and welcome to the forum . What you are seeing is probably Fert. salts build up or from hard water (lime) , If mine I would get new Spag. moss , (Box stores have it in a brick)like the kind i it is in and repot it . Soak the pot, remove the old moss , and check for rotted roots (ones that are dark , when you gently press them they squish , usually they will be at the bottom of the plant ,you will see a stub ( the base of the plant ) . Use a new razor blade or non plant cutters to remove them .
It might be from trying to hydrate the ariel roots the rest have become to wet . Pot it so the ariel roots are in the pot .
When you get the Spag . wet it and squeeze out the excess water , throw in a few Styrofoam ( non melting type) in the bottom of the pot . If the pot it is in is not large enough for the plant to fit in it get a size larger , azalia type pots work better than the taller type. After repotting keep it just moist not wet .
It might be the blooms were just old and it was thier time to go . Hope this helps . Gin