Hermits I wouldn't worry about so much.  A lot of them are found in intertidal areas, tidal pools, river estuaries, so one could speculate that they are perhaps adapted to varying salinities/temperatures/etc.  Just speculation though.  If it's a species collected from deeper water this may not hold true. 
 
That said, I think it's "nicer" to them to acclimate rather than throw them straight in. If that helps you any... 
		
	
		
		
		
		
			
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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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