Well hell, I just reread Dr. Tim's fishless cycle guide, it certainly does say 2 ppm on day one. I misread that for sure. I dosed to 4 ppm. No wonder my nitrites were off the chart and it took so long for the ammonia to come down! Holy hell.I was in the same situation a few months ago & added a bottle of bio spira. The nitrites went to zero in a day or two.
Could be coincidence but that definitely worked for me. Also 4ppm is a lot. Everything I read suggested 2ppm (could be totally mistaken tho)