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			 A few mls of vinegar or acid in a larger tank shouldn't have an effect  Alkalinity is a measure of water's buffering ability and our water can buffer that to a certain extant.I would be more careful in a small system but then you can just ad a little buffer or baking soda to compensate. 
		
	
		
		
		
		
		
	
		
		
	
	
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