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			#1  
			
			
			
			
			
		 
		
		
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			 I just ordered the Hydor Smart Level Auto Top Off Controller and Eheim Compact Pump 600 to put a ATO system together for my 122 Gallon FOWLR system with a 60 Gallon Sump. What does everyone use to hold the freshwater for their ATO systems? Also I was planning on using a rubbermade garbage can and wanted to put it beside my tank 2' off the ground, will it be a problem having it this high or should it be level with the sump? 
		
	
		
		
		
		
		
	
		
		
	
	
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			#2  
			
			
			
			
			
		 
		
		
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			 I use a 30 gallon tank for ato water. Be careful with your ato container higher then the sump you may create a siphon and drain the entire thing. 
		
	
		
		
		
		
		
	
		
		
	
	
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			#3  
			
			
			
			
			
		 
		
		
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			 A garbage can would work just fine but I would have it hidden. I have used a tall column type aquarium for one holding tank and built a section directly into my sump on another aquarium. 
		
	
		
		
		
		
		
	
		
		
	
	
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			#4  
			
			
			
			
			
		 
		
		
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			 The reason I wanted to use a garbage can is so I have enough capacity for when I go on vacation and the friends that are taking care of my tank don't have to fill anything. I figured it should be good for the 2 weeks I am gone. 
		
	
		
		
		
		
		
	
		
		
	
	
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			#5  
			
			
			
			
			
		 
		
		
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			 I've only sized my ATO reservoir to hold no more fresh water than the empty part of my sump can handle without over flowing. I would personally use a smaller reservoir and have 5g pails of fresh water for your friends to add if needed. You can even leave them a powerhead with a hose attached to fill the reservoir up without having to even lift anything. The garbage can would probably work just fine but there is always a chance it will fail and put a lot of water on your floor in a very short period of time. I do things my way for my own peace of mind and this is all just my own opinion. 
		
	
		
		
		
		
		
	
		
		
	
	
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			#6  
			
			
			
			
			
		 
		
		
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			 It's always a good safety feature to have a smallish fresh water top off container, say a five gallon bucket. That way if some thing fails in the auto top system and it sticks on or a syphon is created you don't flood your tank with to much fresh water.  Another float switch/ timer can feed the five gallon from a larger storage container. 
		
	
		
		
		
		
		
	
		
		
	
	
	Very important it can't continue a syphon for sure.  | 
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			#7  
			
			
			
			
			
		 
		
		
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			 I use a clear plastic sterilite bin (kind with the white lids).  It's about 5 gallons, and he a float valve in it, and a ball valve that only let's it refill very slowly from the RO storage container...  (so if something happens with the topoff process, there is limited water that can be added. 
		
	
		
		
		
		
			
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	Single System Setup: 210G SPS reef, 225G FOWLR, 72G water change, 50G frag, 120G sump. I promise a journal at some point! (anyone need some coral frags? I likely always have stuff that is frag-ready)  | 
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			#8  
			
			
			
			
			
		 
		
		
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			 If I have the discharge hose for the ATO not submersed under water I was thinking then I wouldent have a problem with siphoning back, or will I run into other issues? 
		
	
		
		
		
		
		
	
		
		
	
	
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