I'm guessing your still cycling the reactor. Exactly 2 weeks would be about the time Nitrate spikes. (give or take 1/2 week)
I wouldn't do anything rash except maybe slow down the flow through the reactor if it's faster than a drip/second.
If you are still showing such high nitrate a week from now, then I would start to worry.
Double check to make sure your recirc. pump is running properly.
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