I have a number of cerith snails in my nano, and they have laid egges at least three times that I have noticed. The trouble is that I think either my shrimp or my hungry clownfish would nibble on them because they would be continously reduced.  I have noticed a few baby cerith snails though (easy to notice from there characteristic shells) on occasion so I guess a few survived.  
 
Rory 
		
	
		
		
		
		
		
	
		
		
	
	
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