Ring cowries readily reproduce in the aquarium as the female will guard her egg clutch and I don't think the babies go thru a planktonic stage.  My ring cowries have reproduced as my original five are over 10 now and I have found shells of various sizes.   I'm hoping to see if the Money and Chesnut cowries I have in other systems reproduce as well 
		
	
		
		
		
		
		
	
		
		
	
	
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