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			 Just wondering if the rubber pad is necessary under a mag 18. It is sitting in my sump humming along sitting directly on the glass bottom. I can feel vibrations on the glass sides, it appears the pump is working fine. Is this likely to crack my piece of glass on the bottom of my 25gal sump? 
		
	
		
		
		
		
		
	
		
		
	
	
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