I'm planning two different possibilities depending on how I position the tanks.  If it's a flush mount, I plan to use a piece of 1/2" acrylic and re-surface the show side with rubbel rock and portland cement. 
If I decide to position the tanks at 45 degrees from the wall, I will use a half piece of 12" PVC pipe for the overflow/false back and surface that the same way I would have done the acrylic. 
The epoxy might work better than the portland cement for my application.  I would become encrusted with corraline faster too. 
 
Can't wait to see the new pics! 
		
	
		
		
		
		
		
	
		
		
	
	
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