You can either remove the corals from the rocks they are on right now, or just life them up and put new rocks under them. 
 
I would suggest taking all your rocks out, then remove the easy-to-remove corals, and aquascaping the whole tank at once to get the look you want. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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