Interesting... this is from your tap? I guess I would test the water straight from the tap and compare or the leftover water must've been pretty high to begin with. I'm guessing your test kit is ok, since you gave readings earlier from another tank and they were ok. Usually water changes do the trick, but do them a little at a time, over time (over a few hours) and it won't be so stressful to the fish. Just make changes slowly. Good job on the Melafix, but hold off a day until you get the nitrates straightened out, otherwise, you'll just be diluting what you're dosing. When you start it up again, you should see some improvement over the next few days. You may want to drop the air line in even until you get an airstone. Not tryin' to make ya feel bad here, but think about how it might feel if you were only huffing and puffing a little bit compared to yesterday. 
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