Not all plants are high temp friendly, but most would likely survive a short window like that. It'd have to be a pretty minor outbreak for a 3 day heat cycle to kill it. Most heat treatment regimens call for at least a week, or 3-4 days after the last spot disappears.
Today is the first day that I have spotted the SPOTS. And they are not too bad, only a couple spots per Tetra (the other fish inthe tank have no spots..yet).
I have turned up the heat to the mid to high 80s. Anything else I can do in the meantime until I can get some meds?