I have a good sized yellow tang in my 6 ft 100g. Most of his time is spent picking on the rocks and back glass for algae and occasionally taking a lunge at my butterfly fish, just to remind them who is boss. But sometimes he makes quick short dashes around the tank, which is usually when he is pooping.... 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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