The vinegar will affect you PH a little to a lot depending on how much you use.  I used to use vinegar in combination with kalk to keep my pH at the prober level while boosting my calcium levels.   
 
Essentially, if you are getting rid of a couple in this method it should be no big deal.  If you are going after 20 like in my tank it might affect your pH. 
 
A pH meter would be handy. 
		
	
		
		
		
		
		
	
		
			
			
			
			
			
			
			
			
			
				
			
			
		 
		
	
	
	 |