You are adding too much ammonia as far as I can tell. For those not sure how much a cc is, since the ammonia calc. is in ml, they are equivalent. But the normal fishless cycle using the directions here get two full additions of ammonia and then the snack dose, you have done 3 additions and the snack and that is the problem. The directions for the snack dose being added are that it should not go in until you have two consecutive readings of 0 ammonia when tested two days apart. So you did not meet this condition either.
The nitrate test works by converting the nitrate into nitrite and then measuring that. When one has nitrite in a tank it will show up as nitrate on that test. So unless you know your exact nitrite level, your nitrate results are pretty much useless. Stop wasting your time and money testing for nitrate at this point.
3 ppm of ammonia can turn into 2.55 ppm of nitrite. A 3 ppm addition produces as much as 7.65 ppm. Three additions plus a snack produce about 25 ppm and at 16 ppm you are stalling or killing off the cycle. (Note, all these numbers are based on using hobby kits like the API ones.)
Next your test results are not making a lot of sense either. It should be possible to read ammonia more accurately than 2-4 ppm. So that number is not very helpful. There is no way a new tank can process close 9 ppm of ammonia to .25 ppm in 7 days unless it has been seeded with bacteria in some fashion or is very heavily planted. You do not provide any other info except what ammonia you added and what you believe the results to be. We need to know your tap parameters, the volume of your tank, the brand of dechlor you are using and what is in the tank besides water.
So what to do. Start by not adding ammonia until you should be and according the the directions here on the site. Then you need to get the nitrite levels down. You can either start by doing diluted nitrite testing to know how much you have and how much water to change or you can just start with a 50% water change and then test for it. The goal is to do whatever amount of water changes it takes to get the nitrite under 5.0 ppm for sure.
Either follow the directions here for diluted testing here
http
/www.fishforums.net/index.php?/topic/433778-rescuing-a-fish-in-cycle-gone-wild-part-il/ and report the results back here or start changing water. Either way we need to know a bunch more info about what is going on to give decent advice.
Once you have posted the information requested i can make a suggestion of what curse to follow. I generally want to wait 24 hours after adding anything that detoxifies ammonia to a tank before resuming cycling.
