Hi and Welcome to The Reef Tank. It sounds like your xenia is ok. If it were all shriveled looking, not expanded, and not pulsing I would be more concerned. Go to the LFS and get some
rubble rock (small rocks) and place them next to the xenia so it can spread. Then sell them to your LFS for some $$$. Be very careful when dosing iodine. Like most medicine, small doses are helpful, but large doses are toxic. The same holds true for many elements and chemicals in our tanks. I find that xenia can adapt to a wide range of environments...high light, low light, high current, low current...etc. What kind of light do you have on your tank? My xenia grew best when it was in high light and moderate current.
The purple xenia sounds cool..do you have a pic of it?? The pink xenia is most likely
Xenia elongata.
HTH-
Brooke