Well that would be a major bummer, lol. That would mean that the journal I'm keeping is filled with faulty data. The only thing though is this has only happened three times, and took place after I saw my nitrites spike and then start falling. I have seen the light blue on numerous occasions, as well as seen insanely high nitrite levels during the early stages of the cycle (a purple much darker than the darkest one on the test sheet) so I'm hoping that that isn't the case.
I did not mention this before, nor do I include it in the three instances stated above, but I have seen it turn clear a few times
after seeing it at the light blue color. There have time I tested, got a <.25 reading on nitrites, but didn't clean out the tubes immediately. After sitting there for a good while (one time over night) after getting a light blue result, the test turned clear.
*edit*
just found this on another forum. Describes what's happening to me perfectly .
"I'm assuming your doing a fishless cycle and that your ammonia has been dropping to zero in 24 hrs or less. If the nitrite test drops go to the bottom of the tube and are purple before you even shake it, then your nitrite is high off the chart, and it will turn a very light blue or greenish blue after 5 minutes. Mine even got almost clear. I had this same result when I cycled my 1st tank. If the nitrite doesn't start to come down, try doing a water change to get it down to a readable level, 5ppm or less I think is on the API card. You should also be showing some nitrate at this point in the cycle. I'm guessing that you are real close to completion. Your nitrite may stay high, but then it will suddenly drop to 0, almost overnight. After that,IMO, I would keep dosing for another week, kind of a verification period, because it can bounce a bit for a day or two. Hope this helps, good luck."
That just ruined my day...