I agree.  I feel guilty sometimes for having one 4" tang in a 90g, even with big open swimming lanes... 
 
I would vote 120 & up for any tang.  It's the hard, sad truth... 
		
	
		
		
		
		
			
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				90gal Starfire mixed reef, 400W MH (Giesemann 13K megachrome/Icecap E-ballast), (2) 54W T5 Giesemann true actinic, 45gal sump (65W 50/50 PC), ASM G-3 Skimmer, Mak 4 return, Sequence Dart closed loop, foam backdrop, 120 lbs LR, 2" sandbed, & 1 dillhole running the show.
			 
		
		
		
		
	
		
		
	
	
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