SO what is the problem with the SPS.  You could probably get some good advice here. 
 
Definitely 5ppm NO3 is not needed.  I dont think it would hurt but I have had great SPS growth and colour with unregistered NO3 and PO4.   
 
Personally I think that when people see a positive reaction to increasing NO3 or PO4 it's actually a postivie reaction to something higher up on the nutrient/food chain.  Ie. feeding more. 
 
My philosophy is high import (larger bioload, larger amount of quality food) and high export (quality filtration).   Bascially allowing there to be a constant influx of food yet with the filtration ablity to keep the broken down by products (disolved NO3 and PO4) to a minimum. 
		
	
		
		
		
		
		
	
		
		
	
	
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