Don't discount the benefit of a fuge.  As for size...how is it that CPR can sell a hang on fuge (not big at all) if size/volume is so important?  The important part is for the nutrient export and for the opportunity for pods to safely reproduce.   
 
This is just my opinion but I know my numbers got better when I added my small fuge with my sump. 
		
	
		
		
		
		
			
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				Mark...
  
290g Peninsula Display, 425g total volume.  Setup Jan 2013.
			  
		
		
		
		
	
		
		
	
	
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