So it turns out the RBTA definitely killed the Xenia. I waited a couple days to see if it came back and it didn't. I went to pull it out and boy am I glad I did as it smelt like death once it left the tank. I also had a small chunk of purple clove polyp this killer RBTA has eliminated. So if anyone has Xenia or Purple Clove issues let me know, you can borrow my RBTA.
On a side note, I have someone coming by to take real pictures of my tank. He's even got a macro lens and one of those fancy look down lens adapter thingamajigies. Pics to come!