Don't hold your breath
My nitrites have been around .30 for over 3 weeks now! My ammonia and nitrites had been down at 0 for a week or so and I thought I was done cycling so I added two more harlequins to the lone survivor I had before I knew about all this stuff and then got a small ammonia spike, which was quickly taken care of by the bacteria, then the nitrites went up to .25-.30 and I can't get them down. I've been doing water changes every 2-4 days to keep the harlequins from dying. Unfortunately, that is probably why it's taking so long to get the nitrites down. My nitrates have been good at anywhere from 8 to 12 ppm. I even added a BioWheel 100 to boost the BioWheel 200 I had but it hasn't done a thing in the last two weeks except run.
So, stick with it, you are probably in a better place than I am. It seems like the nitrites will never get to zero and I feel so sorry for my three little harlequins. I want to get them more family, but not going to risk it at this point.
I'm so frustrated. This is my first attempt and I have learned a lot in the past 2 months. I'll do fishless next time.
29 gallon
Penquin 200
Penquin 100
3 Harlequin Rasboras (Little Guy--tough, tough, tough; Chubby, and Blinky)