Well I surely wish you success with your new pygmy cories
They are really cool tiny little guys. Cories are probably the only fish I'd consider in my current tank aside from barbs.
And since you added them to the tank what I am about to say is a moot point :lol: but FYI, my Gold Barbs showed no signs of disease for about 12 days after purchase, and then a full-out gill fluke infection took over and got every fish in the tank. They are just recovering in the last 3 or 4 days. For that reason, and another bout I had with Ich, I came to the following conclusion.
Because I have a QT, I will never introduce a fish to my tank without a 4 week QT period. Dealing with disease in isolated conditions is stressful enough, and with proper precaution, QTing, and care, it's not unreasonable to have a main tank that is completely free of disease for the lifetime of the fish. That's cool with me