Hi Greg, it is plumbed together. 
 
This coral in particular though went into my ritteri tank which isn't plumbed into that system. But there's enough transfer back and forth (feeding, or moving a coral over from one tank to another) that if it was, say a pathogen such as a protozoa or a bacteria that it couldn't just hitchhike over and "infect" the other tank. (I hope I'm way off base on this theory though.) 
		
	
		
		
		
		
			
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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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