Well, a bucket of soda water didn't bring mine out, so I'm not sure what will. If it was my rock, I'd take off what I wanted to keep, and toss the rock. I lost a lot of sleep trying to catch mine. He lived in a rock also, but would extend out about 18" to grab snails and pull them back to the lair.... 
		
	
		
		
		
		
			
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				Brad
			 
		
		
		
		
	
		
		
	
	
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