Okay so I have a question for those of you with external overflows.  I rarely see any lower support on the overflow (like triangular supports), but it strikes me that the overflow holds a lot of water...sometimes 7-12 gallons and when I do the math on the weight of that...I get nervous. 
Has anyone had issues with this?  Have you seen some that have been built with supports? 
When I got my first tank quote from Aquarium Obsessed they found humour in my worry about the overflows but they included the supports in the price because I asked for it. 
		
	
		
		
		
		
			
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				Mark...
  
290g Peninsula Display, 425g total volume.  Setup Jan 2013.
			  
		
		
		
		
	
		
		
	
	
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