Well Evil Nitrates are the last of on the chain of decomposition. Meaning that you will first see Ammonia, then Nitrite, then Nitrate.
If you are see increase in nitrate levels after water changes check your water.
If you are running an R/O unit and do not keep it pressurized then that is your problem. R/O unit only work effectively if it is maintained under pressure. And what I mean about effectively is that they not add Nitrates when used.
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Photo anyone? 
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