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			#6  
			
			
			
			
			
		 
		
		
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			 personally, I would stick witht he plastic ones.  The black ones would probably be a bit less visible too rather than the stark white zip ties.  Over time they would probably get covered in all sorts of sessile invertebrates and algae, so i don't think UV would be a problem. 
		
	
		
		
		
		
		
	
		
		
	
	
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