One more thing about damsels.  Even larger ones can change color.  I once bought an entire 30 gallon tank of LR and misc soft corals.  When I got it home and was sorting it out I found a 3" damsel.  I called the guy and told him, and he said he didn't know it was even there but if I wanted it I could keep it or he would come over and take it back.  Well, the damsel was a beautiful.  It was an irridescent white with a blue back so I decided to keep it.  Needless to say, within 24 hours of going in my main tank, he turned to a deep black and has stayed that way ever since.  No one picks on him, and he is an OK citizen except for occassionally chasing my Auriga butterfly.
				
			 
	 
 
		 
 
		 
 
		 
 
		