Xenia is difficult to kill if your tank condition is right. Tiny tissue will grown into a colony. Xenia can adhere to rock if you keep it in place for a day or so. Super glue will kill a small part of the Xenia, but this is not detrimental to Xenia. The remain will attach to the rock and grow. After a day or so, the Xenia stick to rock because it grow n to it, not because of the super glue.
Anemone on the other hand are difficult creature to care for. Any wound will likely lead to infection that will kill the anemone.
Anemone will move to where it like, and stings, kills coral along the way if the anemone is healthy.