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Water Changes

I have a question about water changes.  I have been changing 20% of my 
water every 2 -3 weeks and I usually do a test for NO3 before doing 
so.  All the readings I have been getting are minimal if detected at 
all.  So here is the question.  Do I still have to change the water, or 
just top up the tank?  I know that adding water replaces trace elements, 
but I lose about 10% to evaporation already, so I have to add at least that 
amount back.