I would define "coral bommie" as something along the lines of "a tower-like coral structure sticking out from a sandy bottom."  I thought the term was universal, but after a quick google search it seems I find it mostly in use in the context of the Great Barrier Reef; thus, it might be more of an Australian slang term, but on that I'm not sure. 
		
	
		
		
		
		
			
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				 -- Tony 
 My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills.  Whee! 
 
			 
		
		
		
		
	
		
		
	
	
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