yep...copperband are active all night long.  But eating 2 clams in one night?  that's a lot even for a large copperband. 
  
They could have melted as well.  Small clam less than 3" tend to melt sometimes.  How big where they? 
		
	
		
		
		
		
			
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More fish die from human stupidity than any other disease...
			 
		
		
		
		
	
		
		
	
	
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