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As fort said that stuff would really help out but xenia are one of those corals that can thrive one week and die off the next.. some people can't even keep it at all which no one knows exactly why. A little reading led me to a lecture that touched on xenia and from their experience they got the best growth out of it when they had .02-.05 ppm nitrates. So it seams to "clean" of a tank could be the cause to many people not getting the growth that its capable of.
My levels are either 0 or in the range of .10 the tank has been up since June I have a 106w t5 HO coralife 4 bulb my moonlights are on 24/7 my atinics come on at 7 go off at 10 my daybulbs come on from 10 to 7 calc is usually at 480-500 I don't dose alk or mag so I don't test the Xenia has been in my tank since July and has just now shown signs of unhealthy
Ya best thing I would say is wait it out.. if anything, if you got a buddy with a saltwater tank give him a couple stalks to hold onto incase it does die off. Then you can re add it later down the line so its not a complete loss.