I have a blonde nason in my 180 gallon. You will love him. 
 
It is a very active fish, but so far my 180G is doing fine with it. Mine is only approx. 5 inches, so I have lots of room. 
 
I agree don't overfeed. I find him and the others tangs graze the tank continually, keep everything clean between actual feeding times. 
		
	
		
		
		
		
			
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite) 
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker 
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO) 
Type of Aquarium: mixed reef (SPS & LPS) with fish 
Dosing: Mg, Ca, Alk 
			 
		
		
		
		
	
		
		
	
	
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