I have a royal gramma in a 28 gallon with two true percs and a damsel and SHE is very peaceful.  If you make sure to get a female you will not have such troubles with aggression.  I had a male and he was nice, too, but got a little too aggressive for that size of tank.  Just my personal experience. 
		
	
		
		
		
		
			
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				PIER PRESSURE 
28 Gallon Saltwater Reef Aquarium
			 
		
		
		
		
	
		
		
	
	
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