Whirling isn't exotic as it sounds. Actually, for the west coast it is a major problem in all the lakes, rivers, streams, etc....
I spoke with a Biologist at Idaho Fish & Game yesterday who also keeps aquariums. When I explained all the symptoms he has no doubt it is whirling disease. He works with one of the teams that has been trying to fight it in the trout and salmon here.
I also obtained a lot better information about contagion and by quarantining the tetras (which I'm trying to split them up now I just don't know where to put the second one) I took a good step because most of the time it spreads by dead fish and fish that have been picked on because they can't swim right.
He also said that if I am unsure to watch it for about a week (as even in a fish this small it will take a minimum of a month, probably closer to two, to kill it) and the boils, etc... should start appearing.
As soon as I am home with the energy I plan to euthanize it and then carefully watch my main tank.
He also stated that it is about a 2 month period to fully very no infection in the main tank. It takes 1 to 2 months after infection for swimming problems to show up then 2 to 3 weeks for the boils and 2 to 3 weeks later death.
His attitude was the people that were, and many still do, breeding tubifex worms w/ trout and salmon hatchery runoffs were not smart as many diseases move via Tubifex worms and can migrate from cold water to tropical and marine fish.
My guess, although I haven't called petco yet, is that they came from California and the breeder feeds live Tubifex worms. This especially sounds likely since the first instance of the migration to tropical was found in California by someone who was feeding live tubifex worms bred from hatchery runoff.
And with Petco based in California it wouldn't suprise me if they get most of their fish from breeders there.
