I cycle two tanks, a 40ltr quarantine and 400ltr main, doing this for the last 5 weeks. Ammonia is '0ppm, Nitrite 8ppm and Nitrate 100ppm. or more (this is after a total water change two days ago) I add Ammonia and bacteria on a daily basis, this is on top of inserting media from a working tank. I was advised to stop adding Ammonia while adding bacteria, so two questions. 1. Will stopping the ammonia kill the bacteria that already exists? 2. What the results above tells me? 4ppm and 100ppm makes no sense to me.
You need to keep adding ammonia to feed the bacteria. If your nitrate is up at 100 that suggests the cycle is functioning but not yet complete (as you still have nitrite). Do a 50% water change to reduce nitrate (as it can stall the cycle at a high level), and re-dose ammonia then check after 24 hours.
4ppm ammonia once converted to nitrite produces a higher ppm amount of nitrite, and nitrite converted to nitrate is higher again. If I remember rightly, 1ppm ammonia produces just under 3ppm of nitrite and just under 4 ppm of nitrate.