There are many ways of getting rid of it. Personally, I love mine, but when I have to remove the ones that are spreading in areas I don't want them to, I just cut them close to the base, wait a few minutes for the leftover to retract and clump up a bit, and use fine tweezers to pry it off the rock. No more xenia! Takes a bit of patience, but at least no xenia will grow back. This is easier if you can take the rock out.
Lets Go Caps!!!