Blue, did you make a typo?
Dana's tank is not yet cycled, not only 1 wk into the process. She said there were nitrate levels showing in her tap water, which would explain why she is showing low nitrates and they are dropping in the tank as the plants are consuming them.
This is always the hardest part for anyone, because its so tempting to add more fish. Please don't. The readings you have posted thus far tell me that your tank hasn't really begun to cycle yet, and it needs time. I am curious about the test kits you are using? (name brand and type <liquid, strips, dry tabs) Also, I think I am unclear about how often you are doing water changes and how much water at a time? Are you doing any gravel cleaning with the water changes?
As for your stocking, I think the move from neons or cardinals to green fire tetras would be an excellent one. The green fire tetras are a lot sturdier than either neons or cardinals, and better able to defend themselves with those danios if needed. At the same time, they are very peaceful, and very bright and colorful once they've settled in.
I also found another tetra that I had overlooked on my prior lists...
The von rio tetra, aka, flame tetra: http://images.google.com/imgres?imgu...icial%26sa%3DN
This is not a very good pic, I couldn't find a good pic of them online. When they settle in, the body is a bright olive green and sparkles when the light hits it right, and the back and lower fins are a bright ruby red. This is one of the most colorful of all of the tetras I've seen, while still being sturdy and staying small. These are awesome fish! They mix with the platys, the danios, the otos, the corys, the botia loach, and the green fire tetras.
Mush, your tank sounds like it's on the final swing... almost there, congrats!!! 4 - 6 wks is the average tank for cycling, give or take a bit depending on the individual tank/circumstances.