I'm glad it's not the same seller, WHEW!
I did see some in Montana that I *almost* ordered from. Now I'm glad I didn't. Anyway, the ebay post didn't read anything like what you said the "bad" one did.
I do have a QT tank, and anti parasite med (Paragard) as well as several antibiotics. (Furan, Kanaplex, and both Maracyns). Like you, I've also had fish get sick and die within days or two weeks, and they looked fine when I got them, so this really makes me nervous. PLUS, it was 88 degrees today, and these fish have to travel over 1,000 miles, and I'm rural. It's supposed to get hotter later in the week, so that's a big concern for me. It might take 4 days for them to get here from Montana, as I'm rural. Here is part of what the ad said.
These are a beautiful gold and black metallic endler (wild type guppy). This are one of the types of fish used to create metallic guppies such as the Mang SuperCross and Steel Nebula guppies. Younger males have a silver color that turns golden as the mature.
The only thing I don't have is an anti-fungal. Which one do you use?