This is my first iteration, and it took more than 2 weeks for then ammonia to start dropping. Now ammonia stuck at the current level, it never went to zero. As far as the nitrite goes, it started dropping about 5 days ago and it stays around 40 - 80 for the last 3 days.
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I suggested a water change because it won't hurt anything and will make it easier to monitor the nitrites.Do you mean your nitrAte has been around 40-80 for the last three days? The nirIte test only goes to 5.0 on the reference sheet. From what I can tell from the picture, your ammonia is .25, nitrIte is 1.0, and nitrAte is 40 ppm.
I don't think you need a big water change again. I think you just need more ammonia and time. What kind of biological media do you have in your filter and you aren't changing any of it out, correct?
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I suggested a water change because it won't hurt anything and will make it easier to monitor the nitrites.