Yes, those levels will go down. So far, they are following the correct pattern. First you get lots of NH3, then it's converted to NO2 (nitrite), tehn NO3 (nitrate). Now that you have a full compliment of bacteria converting ammonia to nitrate (evidenced by the lack of NH3), you'll need to grow the bacteria tht convert all the NO2 to NO3. This happens on it's own, so you just need to watch.
Just leave the tank until the NO2 is at zero, then do another small water change. Over the next 4 to 6 weeks, you should also see your NO3 drop to zero, assuming enough rock and/or sand.
NO2 is still toxic to most critters, so avoid adding much until it's gone. NO3 is less harmful, so you can start (slowly) adding things once the nitrite is zero.
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Brad
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