I always thought putting foam under a tank wasnt a good idea. If it gets compressed enough, the weight of the tank is spread across the entire  bottom pane of glass instead of just around the edges. I think there is some good info if you do a search on RC. 
		
	
		
		
		
		
			
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				Chris
			 
		
		
		
		
	
		
		
	
	
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