Closer...Did you change water to get the nitrate to drop? That's the only way I know except for plants (do you have any live plants now?)...& maybe the beneficial bacteria is working?!? But it can be hard to tell the test colors...Is there someone else in you household to offer an opinion on color? My husband sees color diffently than I do. It's not necessarily gender based but it can be. A second set of eyes may help.
It looks like you're getting there. I haven't used "bacteria in a bottle" products, 2tank has...