They were used to his tank too. Once you bagged them up, took them home, and put them in an unfamiliar tank, they lost that feeling of security they had. It'll come back in time. Every fish I've ever had was this way. Some get over it quicker than others.
BTW, PM me the info for that breeder if you don't mind. I'd like to visit some new ones.
"What, exactly, is the internet? Basically it is a global network exchanging digitized data in such a way that any computer, anywhere, that is equipped with a device called a 'modem', can make a noise like a duck choking on a kazoo." - Dave Barry