If you always are having ammonia in your tank your load is too high or you are over feeding. How much LR do you have in your tank ? How often do you feed and how are you feeding ? Nitrates are pritty normal . Fish can tolerate them on the lower levels . To have 0 nitrates in your water you will need to run a refug with chaeto in it or have a DSB.  
Also like stated before turn of your skimmer when your doing your water change. I turn mine of as well as the lights . Becuase as the water level goes down the light impact will increase and it can bleach out some of your coraline or shock your corals. 
		
	
		
		
		
		
			
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				30gal Reef 50lbs Fiji LR 25lbs Fiji LS. 10gal sump/ref 
Remora Maxi-jet 1200 , Mp10, HID 175 Swing arm 
1 False Perc,(nemo) Blue Mandarin (Houdini) 
Soft Corals,CUC ( 7 months old)
			 
		
		
		
		
	
		
		
	
	
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