I have been out of reefing for about 10 years and just getting back into it. So I haven't cycled a tank in ages. I am seeing some conflicting info on nitrites. One source is saying dose 2 ppm ammonia and within 24 hours the ammonia should be converted to nitrites, and then nitrates, because both ammonia and nitrites are toxic to fish but they can tolerate nitrates easily. I see other sources saying the ammonia should be at zero within 24 hours and nitrites are not so important. I have set up a tank 3 weeks ago, used fritz turbo-start, I guess within 2 weeks the ammonia was being consumed in about 24 hours, but the nitrites were continuing to lag, seems like it is taking about an additional 48 hours for the nitrites to be zero. Not sure which source to believe.