I can't see how a dieing pump would make white stuff in your water.  I would bring it back to Big Als and see what they say. 
 
Have you mixed up new saltwater that is not from your old stock?  I would get the rock in there, you will be amazed at what will grow back in a couple months, dont worry! 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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