Jenn, I LOVE that article and refer to it often, but would really think people would benefit from it being updated with good instructions on using Prime & Stability in a QT/Hospital tank. I.e., even though you use Prime, you will see Ammonia climb, but it's not toxic at that point.
Personally, I ran into problems and am still very confused in QT tanks with Prime & Stability in how often to do water changes and then readding prime/stability. I burned through ~$300 in fish in failed QT attempts. It sucked.