Personnaly I have Skimmer, Kalk Reactor, Calcium Reactor, Coil Denitrator, Auto Top Off....All of which I have built my self or was built for me Which I find saves you tons of money if you DIY everything....My skimmer I built cost me $80 and it is equivelant to something that would cost around $500.... 
 
and Like Bev Said none of it is neccissary, I have them because I am lazy and don't want to dose everyother day and do weekly water changes so this equipment lets me go longer between water changes!! 
		
	
		
		
		
		
			
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				500G Mixed Reef
   
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Electrician, Electronics Technician, I can help with any electrical questions you might have!! 
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Kevin
			  
		
		
		
		
	
		
		
	
	
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