I've also kept a few different species of Eunicid and quite enjoyed their antics.  I've never kept zoas, though... I would still attempt to catch him in the act before deciding to rid the tank of him. 
 
  I suspected that one of mine was eating xenia...but that was a good thing at the time. 
		
	
		
		
		
		
			
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				400 gal reef.  Established April, 2007.  3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways,  Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
 
My Tank:   http://www.canreef.com/vbulletin/showthread.php?t=28436
			 
		
		
		
		
	
		
		
	
	
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