frag plugs and discs drive me bananas !  However, I do use rubble to mount my frags and then mount the rubbled with frag to my rockwork.  I like doing this because it is slightly less ugly and allows me to easily move the frag around which I do frequently. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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