Re: cycling tank-am I done?? (should I add a fish?)
It is generally not possible possible to cycle a tank in 12 days. I am surprised that you have no ammonia, because I would expect some left over from your goldfish.
How are you "feeding" your tank? I would recommend adding a few drops of pure ammonia to your tank, and making sure it shows up on your ammonia test. Then look for nitrites, and finally nitrates. When you see your nitrite levels rise, and then fall, leaving only nitrates in your tank, you know your tank is cycled. The chances of it being cycled now are slim to none.
Good luck!
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