No offense guys, but most likely any if not all of the Fish you buy anywhere, unless completely treated for at least 6 weeks (and there is no one that does that) are coming in with tons of parasites and pathogens....it is up to us as hobbyists to properly QT our Fish before adding them to our displays, if we want to ensure that we do not transfer anything into pour tanks....Petco is no better or worse than any other LFS...It is up to the source of the animal, and the care it is given while in transfer from collection to your tank. Proper husbandry goes a LONG way I this industry....but the rest is left up to us....Hopefully each shop takes the best precautions and steps they can to secure and maintain the best quality livestock possible...but we all know that price unfortunately effects quality....
But in this case, I know where they are getting them from (very good source)...And Adam does a good job maintaining that particular Petco...