Hopefully all is well, any recent additions? could have picked up a pistol shrimp hitch hiker, I remember having one and it souded exactly like cracking glass (unfortunately I have lived thru that also) The sound happend on a regular basis for about three years and suddenly stopped, guess the little bugger finally shot himself, good luck. 
		
	
		
		
		
		
		
	
		
		
	
	
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