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			 For a 90 gallon you'll probably want at least a 20 gallon sump in order to fit the required equipment. The more space you have to move around in the stand/sump area the better, otherwise it gets frustrating and overcrowded really quick. Remember that the sump is only about half-full, so you aren't actually adding 20 gallons to the system size. 
		
	
		
		
		
		
		
	
		
		
	
	
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