That's good news. It's probably a false negative reading for the nitrate test. The ammonia and nitrite tests are easy (aassuming this is the API kit). Only the nitrate test gives trouble.
Shake nitrate solution 2 like crazy for two minutes tapping the bottom edges of the bottle on something. Shake test tube for 1 minute and let sit for 5 minutes waiting for color to develop.
Shake nitrate solution 2 like crazy for two minutes tapping the bottom edges of the bottle on something. Shake test tube for 1 minute and let sit for 5 minutes waiting for color to develop.