Thanks for advice,
@BlennyTime! I would like to split the Xenia onto its own rock, but I am not sure how many islands I can add in limited space while also including the cave and arch. Maybe I will put the Xenia on the island with the BTA's. I will have to research if they can "get along" (or at least not destroy each other, while limiting the other's invasive tendencies with warfare?).
Can you clarify what you mean with the bubble coral? Are you referring to closeness with the Montipora or the structural rocks? Should bubble corals be placed in the sand?
Yeah, I know that the anemones can move. I am hoping to limit this with conditions, but I will see how it goes. If I can somehow establish them where I want and catch splits while they are moving, I can avoid invasion issues. I will continue to do research on the subject of limiting movement if possible.