I have my rock sitting on eggcrate and then I have a thin layer of sand covering the eggcrate.  I have a little over 100lbs of LR in my 75G and I'll bet there's not more than 6 to 8 square inches of rock touching the sand. 
		
	
		
		
		
		
			
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				Best Regards, 
Scott.
  
  
			 
		
		
		
		
	
		
		
	
	
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