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			 Masonary bit, but don't use PVC but 3/8" or 1/4" acrylic rod. You won't have much success drilling live rock wth a 3/4" bit without cracking the rock, so use the smaller acrylic rod and the corresponding drill bit.  I also use hydraulic cement to cement the rocks together. 
		
	
		
		
		
		
			
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	-=Bryan=-  |