waterdrop
Enthusiastic "Re-Beginner"
The above confuses me. The API freshwater ammonia test shows green if you have ammonia and drops to bright yellow at zero ppm (or at it's threshhold, which is not really zero of course.) Orange is not part of the ammonia test, only the nitrate(NO3) test.I am not reading the nitrates wrong, 0 is bright yellow, 5 is orange. BIG difference.
There is no ammonia in the tap water.
Is it possible that the ammonia is actually breaking down into small amounts of nitrites which the plants are taking up, thus the results are showing 0.
Perhaps you have the salt water test?
~~waterdrop~~
ps. Have forgotten the salt water colors, so have no idea..