wow, Kien.  Just saw your thread.  So sorry to hear about the SPS losses. Your tank has always been one of my favorites, even though I've never seen it in person.  On a plus side, wow I love the fish you have.  Those anthias are awesome.  Glad your trekking on with it. 
 
I left for a weekend and lost a football sized colony of blue polyped pink birdsnest a while back for no apparent reason as well.  Broke off a few frags before it totally died and the frags have been doing well for me.  The colony was about a year and a half old. 
		
	
		
		
		
		
		
	
		
		
	
	
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