You got some GREAT! advice in this thread. The first thing I always do if I have a problem is a PWC
, followed by testing.
Xenia can be strange sometimes and we still do not fully understand why. The one thing I can tell you is that if you hear, "xenia likes dirty water," this is NOT true. I kept pom pom in pristine water and many others have as well. I think the misconception comes because some corals grow faster when there is escess nutrients in a system.
One thing I have experienced is that xenia is sensitive to low PH.
Most people in my local reef club have so much that everybody gives it away.