I recently tested PO4 at 0.16ppm but will have to get a new test kit for nitrate.  I definitely agree that with the higher levels I'm not seeing my corals bothered by the higher values.  I do want to get them more in the mid range levels.  Do you think this can be achieved with biweekly water changes using RC?  I am down to my lay pails (one opened and one full) so I can definitely transition to a different salt.  
 
The draw for Alk/Cal on your tank makes sense to me from looking at your photos.  I definitely don't have any ALK or CAL precipitating out.  I will test the nitrate hopefully tomorrow.  I'm due for my WC tomorrow as well so I can test the values later on.  Thanks for the information tang daddy, hopefully I can get a handle on this. 
		
	
		
		
		
		
			
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				300g Basement Reef - April 2018 
			 
		
		
		
		
	
		
		
	
	
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