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Disregard nitrate which is insignificant in marine setting unless sky high and geared for freshwater.
I assume that you did not add ammonium chloride. If true, the nitrite is likely the oxidized ammonia that was generated from the die-off of organisms on the live rock. If you need to confirm this, add a little ammonium chloride, say 0.5 ppm, and watch it disappear.

