Hi Melissa,
I love your tank. I wish mine was like that. Talking about a coral take over, here is my tank. The Anthelia has taken over my tank. I believe it is a cousin of the Xenia coral you have. In the near future, I will be removing the Anthelia.
Right side of tank:
Left side of tank:
Oh, here is a pic of King. It is a Black Cap Gramma, my wife and kids named it.