Astrea snails have been not so great for me, the ones sold as "turbo" snails have died within 3-6 months and/or have been not very effective for clean up.  
Nerites have been by far the best, for clean up and living a long time. 
		
	
		
		
		
		
			
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				My Other Car is a Reef Tank
			 
		
		
		
		
	
		
		
	
	
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