There is a lot of stupidity in these three pages, so let me just ask if the ammonia is more under control and the clowns are alright, for now? Nitrite could be interfering with your nitrate test, but don't worry about that. Nitrate is not going to be a concern of yours for many more weeks or months - just forget about it until you start to see some film algae. Don't sweat nitrite - it is mostly harmless to your fish so don't even bother testing it, IMO. Keep the ammonia lower and wait for it to hover and stay very near zero. Cut way back on feedings and change some water if you have to to keep it as low as possible. API are not great test kits and have a huge margin for error, so even if you can order a Salifert Test Kit somewhere for $12-15, it might be worth it. The truth is that ammonia beyond a trace can hurt gills even if death does not come... think of it as being in a burning building even if you do not die of fire where your lungs can be damaged for a long time. Of course, our fish cannot tell us this and some humans presume that if they don't die then they are OK. However, you do need a bit of ammonia to fuel some bacterial growth... so low level amounts.
Once your ammonia levels get near zero, then slowly up your feeding amount until you are at a normal level for your current fish, all the time having levels near zero. Once this stabilizes, then you are past the first part which is just for this bio load. New additions need to be slow too to allow the bacteria to grow and catch up with your new load since you won't have an abundance to just multiply. Tanks can still have issues even after the first part where they have some bacteria, but not enough to quickly multiply.