xenia are very easy and hardy, if it doesn't purple the rock up it'll at least spead out and cover it soon enough. You could pull or cut it off by you'd have to attach it to something else which is a pain imo.
Ya zoa's are awesome and you can get some great color. If you have decent lights you can go with torch, frogspawn, hammer and bubble, those are good starter coral too and add some nice movement to your tank...