This is a sad story but very relevant.
One of my first jobs out of high school was Petco, I worked there a full year before quiting. I will say that the care of the animals has a lot to do with the General Manager and Animal/Aquarium managers. If they are knowledgeable/care, the animals CAN be decently cared for, but in my experience that was not the case. My GM was only interested in costumer service and keeping labor down which resulted in the animals getting inadequate care and attention. Those working with the animals (myself included) were only educated on their care by fast food restuarant style training programs we did on the computer for a few hours that we weren’t even required to finish before we were responsible for their care. I was very interested in reptiles so I did my own research but most of my coworkers had no idea and I admittedly had little idea regarding the small animals (the rodents) or the fish as I didn’t do independent research on them.
I bought my first snake there, a pastel ball python. I wasn’t allowed any reptiles growing up but I was in my own apartment so I could finally get one and was very excited. Well. She and every ball python had Inclusion Body Disease. They started dying and no one at the store had any idea why. When mine started to exhibit symptoms I researched and realised she was going to die a terrible incurable death because the place I worked for purchased her from a terrible wholesale reptile mill and didn’t bother taking any of them to the vet. I took my girl to the vet and had her euthanized and quit about a month later. While I worked there I witnessed many unnecessary deaths and complete ignorance on proper care. The general consensus among the staff was that Petco policy was in place for a reason and that is just how things are run and its unfortunate but profits and costumers come before the animals.
I always try to tell people to please consider purchasing reptiles elsewhere. I have a modest little collection of ball pythons now, all from breeders, and they are doing fantastically.