Just wait - it can take a long time for calcium and alkalinity to come down.  I wouldn't have increased alkalinity to 8 dKH - I would have left it at your usual 7.0-7.5 dKH because bouncing alkalinity is really not good. 
		
	
		
		
		
		
			
				__________________ 
				~ Mindy 
 
SPS fanatic. 
			 
		
		
		
		
	
		
		
	
	
	 |