I overdosed mine so high that the ammonia after a 50 percent water change was still off my api test kit chart. So it was high. Let it sit and u may in the end get over 160 ppm
of nitrates like mine but my biological filtration is so good because of it. Think of it like this. It may take alittle longer to cycle but ur going to have more bacteria in ur tank afterwards because they had more ammonia to eat. Some may disagree with me but u say leave it that high.