I am dosing my 20 gallon daily. It will never go to zero but goes from 4ppm to .25 in a day. Was told it needs to go to 0 in 8-12 hrs though. 6 days into cycle, & adding ammonia daily to 4ppm. Every day ammonia is back to .25 with 0 nitrites. Nitrates have been reading low until today. 20ppm in tap water btw. Yesterday has the usual ammonia of .25 ,0 nitrites, 40 ppm nitrate. (20 from tap). Added yet again to 4ppm ammonia. Today is .25 ammonia, 0 nitrites, id say nitrates..idk. Between 80 & 160 if not more, its red. But never seen the slightest nitrite. I just keep re-dosing or cld it be cycled & somehow skipped the nitrites. Proper aeration, no live plants, API good till 2017, added some new items to tank as well as established bb from other tanks.