I use caulerpa in my refugium.  Yes, it does die back periodically...but never completely.  I've never seen any ill effects from any die off.  I usually harvest plenty of it before it does that. 
 
  Any that escapes into the DT is immediately consumed by my fish.  In fact, I feed the harvest to them and they devour it.  The ultimate in recycling! 
		
	
		
		
		
		
			
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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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