Found trying to use a reactor to bring up levels was just spiking the alk. Once I clued in to supplement the ca/mg first, then maintain with a reactor things settled down. 
 
FOWLR, I'd probably skip the cost of a reactor as will find things fairly steady with water changes only and can always tweak with a bit of the bulk chemicals if needed. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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