Reading up on bio pellets & they don't recommend using with phosphate removal. So can't use foz-down ? 
Also so adding vinegar possibly could be killing some bacteria but feeding others . Could that be why the increase in nitrates ??? 
I've read where it takes , say , 3 months before nitrates drop . 
		
	
		
		
		
		
		
	
		
		
	
	
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