I would presume that if the ammonia load was small, there would never be real high readings. I have been adding 12 ml ammonia ( I guestimate it's a 10% mix) every day. Going on 2 weeks now and going to go take readings now.
ammonia (before feeding) 0ppm, nitrite still off scale but possibly dropped to 6ppm, nitrate 20ppm. Looks like there is movement! Going to switch to a twice a day feeding with ammonia to try preventing it from going to zero; half amount of course.