I wouldn't let the nitrates become detectable but I would slowly increase feedings until nitrates start to become detectable or you get a small algae bloom and then back off on the amount a little bit.  
  
Also feed an assortment of food... cyclopeeze, frozen mysis, finely chopped squid or oysters ect. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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