We've repeatedly told managers at our local walmart that we are opposed to the chain selling any live pets. They deal in bulk supplies and are too busy moving products to actually take the time to care for the pets. The last few times we've been in there, half the tanks have had fish dying from dropsy. Whenever we talk to the employees about the situation, some simply don't care (which is probably the common reason for all the problems). The ones who do care have told us that the majority of the fish just die, but the company doesn't care - they just keep sending more fish. We've pointed out to them that fish like the dragon gobies and puffers require brackish water to survive, and not one of them had ever been informed of this. Not that it matters because ALL of their tanks are on the same filtration system, so they couldn't set up special tanks even if they wanted to. We've been told they get in the dragons week after week, and they might sell one, but the rest die every week.
Yeah, we're pretty fed up with their policies, and we try to discourage anyone from buying fish from there. If we do happen to buy one, it always gets a quarantine tank to itself and special treatment to try to nurse it back to to health. Sometimes we succeed.