I moved all of my rock and media over from a 4 year old system in November
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did you reuse old substrait or new? If you reused did you rinse? If you reused the old stuff then that is more then likley your source. And you didnt answer my question about your ro system
I used all new live sand
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Tds is measuring 1.25
It is a BRS ro/di unit
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Ok, how long has this tank been up and running? Is it possible its still cycling?
It has been up since thanksgiving. No chance of still cycling. All other levels are ideal but the nitrate
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how much are you feeding?
Well he does have an eel 
The real answer is the only way to get it down is with water changes, lowering the amount of ammonia that is getting created and upping your area for anaerobic bacteria.
Ammonia is created by anything decaying and fish waste. To combat that is were a good skimmer, fuge or scrubber or combination of them come in.
I feed twice a day for the fish and every other day for the eel
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