I have a pink pulsating xenia.  It has been in my tank for three months and has been doing very well.  Yesterday I noticed on the bottom of the one branch...a white discoloration with a small receding hole.  There was a "hitch-hiker" crab molting in the top of the xenia.  I quickly removed him from the tank. I don't know if he was picking at it or not.   The xenia on that branch is not opening up and the hole seems a little larger today.  Will it heal on its own?  I add trace elements once a week and iodine.
				
			 
	 
 
		 
 
		