Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Some tests do not last very long.
Why not repeat the test, but shake all the reagents twice as long as they say to in the instructions.
Other than that, do a 50% water change, and see if the NO3 drops by anything like 50%. Then do another one. That should make the NO3 something like about 20 ppm, which is a much easier color to see. I cannot tell the difference in all those deep pink to red tones. If it is any of those shades, I do not bother trying to sort it out, I just do a water change or two.