Since we're on the topic of Xenia, I ran across this while looking at other stuff, and it kinda blew my mind.
https://reefs.com/2015/09/23/remarka...s-found-xenia/
(scroll to the bottom. That xenia shrimp is incredible.)
It's a whole little cryptic world of fish and inverts that mimic xenia and live embedded in it.
I've had it stuck in my head since I saw it, and a small part of me has been thinking about reworking a hunk of my tank to devote to a xenia community.