I have had 13 or so in a 130g. They never school together like I thought they would. They usually hide behind rocks, powerheads, etc, separately. They are now down to 7 after two years. 
 
I read somewhere they like to graze all day long on tiny planktonic foods, and since then, I have fed them with freeze-dried cyclopeeze, "Reef Chili", Acan Plus, and even Combo-vital. 
They do love picking these food off the surface and water column.  
HTH.Lenny. 
		
	
		
		
		
		
		
	
		
		
	
	
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