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			 I think someone mentioned earlier, this is basically asking if you keep SPS ( mainly acros) or not. If you have a softie or even LPS tank you can likely get away with water changes and likely never having to dose, unless you have a bunch of coralline or something. With a bunch of SPS though you can quite literally lose everything by having your doser stop working and you discover it 24 hours (or even less) later. 
		
	
		
		
		
		
		
	
		
		
	
	
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