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			 What type, how much, and how often do most people change? or if you even use it. I use and try to change once a month. I fill one compartment of my Fluval 304 with carbon. ( 55 gallon tank) Just curious what others do.   
		
	
		
		
		
		
			
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		Marty 50g reef, bubble king skimmer,20g sump,zeovit system, PM cal reactor  |