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whats the test kit you are using? API master test kit, bottlt #2 need to be shaken vigeriouisly to mix the chemicals.
and nitrAtes shouldn't of droped unless; inaccurate reeding of test, A water change has been done, You have vert heavy planting which is using the nitrate or lots of algae (which does the same as the plants).
the best e=bet is an Inaccurate reeding.