Yep auntyjude, that's the kind of thing I used to get if I raised my concerns about providing a proper environment for the animals for sale. At the end of the day the staff at petstores and garden centres etc are mostly just kids on minimum wage, so apart from a small percentage who have a genuine interest in what they are doing it's just a dead end job for most while they are at college.
The managers on the other hand need to keep the business viable, the sad fact is the wholesale price they pay for run of the mill aquarium fish, or axolotls, aquatic frogs or Asian newts etc is so ridiculously low that they couldn't care less if they eat gravel and die. Truth is, they make almost all their profit from dry goods like filters, heaters, koi pellets etc, so the couldn't care less staff are constantly under pressure to sell accessory's. If they can convince customers that they need a heater and gravel and maybe some marine hallibut pellets re packaged in a tub with a picture of a newt or whatever on it to go with their dying amphibians they've done their job in the eyes of their boss.
Sorry for ranting, I'll take my med's now!