Xenia Shrinking
 

Any ideas?

From this:
http://i67.photobucket.com/albums/h316/das75/Pink_x.jpg

to this:
http://i67.photobucket.com/albums/h316/das75/shrunk.jpg

over a couple of months. It's more the PomPom type (thick stock), Alk: 9dKH, CA: 410ppm, pH: 8.3. No problems with the other sofites or stonies and the other Xenia (xenia elongata?) is still growing like a weed (below).
http://i67.photobucket.com/albums/h316/das75/X_elog.jpg

do a water change
use activated carbon

Or God forbid you have a bobit worm that eats it

check your water. when i first started mine used to do that and it turned out to be salinity

Temp
 

that was one of my first corals. it died and i found out it was due to temperature Sensitivity . i run a 20 And was having spikes over 80-82 F. it melted away. thats my thought.

Have you added Lugols Iodine? It will shrink/kill xenia. As far as I know other Iodine's are okay.?? Not sure but I tried the Lugols and it was an immediate reaction.