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			 how are you maintaining alkalinity? Are you using an auto-doser? I had problems like this on my old tank when my alk levels weren't stable over the long term. 
		
	
		
		
		
		
		
	
		
		
	
	
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			#2  
			
			
			
			
			
		 
		
		
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			 I am using a bubble magus dosing pump, dosing two part. Using baking soda (arm and hammer). 
		
	
		
		
		
		
		
	
		
		
	
	
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