I'm debating my first beginner corals. I don't want anything that's super sensitive. A rock island of pulsing xenia seems like a perfect addition. However, I've seen pictures of what it looks like when it covers the entire tank. Is that something to be paranoid about? If I put it on its own island, will it eventually spread to the main structure? If it does, is it impossible to keep in check?
Is it better to avoid altogether?
Is it better to avoid altogether?