Ok so I'm curing 15lbs of rock. Yesterday the nitrites test showed .12. Today I would say that they are almost 0. Hard to tell from the color, it looks clear to me (which would be 0) but I always like to round up. So anyway it's well under .1 which is the lowest color on the test. Do the nitrites normally drop this fast? The test has been hovering around .15-.2 the last week and in 2 days it's gone to basically 0.