Thanks everyone for the tips! Here's a quick update...
I decided to get a quarantine/hospital tank - especially since I'm in the very beginning stages of stocking a 55 gal. From my research, the pros of a quarantine far outweigh the cons, and I'm learning that the hard way.
So, all the rainbows were rounded up, along with the infected platy. They were placed into the hospital tank, where I'm dosing the full amount of Pimafix and Melafix. So far so good, the white has disappeared, but they don't have much of an appetite (might be the stress of changing tanks). My LFS doesn't have salt, so I need to keep an eye out for that or order it online.
The cories, ottos, and remaining platy in the main tank are looking great - no signs of sickness or ill health there.
My plan is to keep the hospital going for seven days of treatment, and if all looks good, releasing the fish back into planted bliss.
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