I think it is pretty common that a new introduction (fish, shrimp) gets attacked/eaten within minutes of entering the tank.  Something about their confusion...they are new/interesting...they don't know where to hide or how to behave...makes them subject to attack. 
 
  Once successfully introduced into the tank, they can often last quite a while. 
		
	
		
		
		
		
			
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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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