You know, I find it puzzling sometimes when persons decide on what they think is the best way to keep a certain fish.
I run the fish department at a family owned pet shop. Unfortunately, my boss and I do not see eye to eye on many things, but there is not much I can do about it. We can not refuse a sale, it's store policy that a person should only wait 24 hours before adding fish to a newly set-up tank and the worst one would be no euthanasia of severely damaged fish.
Now, since you know that I'll tell you a little story. We sell feeder Comets for 79 cents so they go pretty quickly and get put in some of the worst set-ups (from what I've seen and heard). A day that I was off a lady bought four 1.5 inch Comets to put in a half gallon "tank" with no filtration, no air pump, not even gravel. She comes back the very next day with 2 dead fish in it and 2 surprisingly still swimming around and she asks for a refund or replacements. When I looked over, I laughed and said "Those fish were sure to die the second you put them in there. They are high waste producers and need much more water to live in." Unfortunately, I couldn't be specific on numbers considering my boss has cameras with mics and listens to every word I say. He disagrees that Comets need to be in ponds or at least a 75 gallon tank. Anyways, I was so shocked on this persons ignorance and was very angry with whomever decided to sell these fish to her.
I do everything I can to get a customer to get something as close to "an okay set-up" as possible. The Bettas have to be the worst ones, being put in the same sized cups that they live in at the store (about 6 ounces), vases, bowls, little half gallon tanks with no heating or gentle filtration (I'm a 2.5 gal advocate).
People putting KOI in a fricken 55 gallon tank makes me even more disturbed, but since it's been about 4 months since I've started working there, I've learned to try and negotiate with the customers (away from any microphones).
There are so many people who I try to explain the Nitrogen Cycle to who just think of it as babble and go on with their picking and choosing of big fish for their little tanks. Prime example would be a couple who purchased a 6 inch Oscar for a 10 gallon tank. My colleague does everything he can to sell and get a tip and it enfuriates me sometimes. I've fed these fish every day, changed their water, bonded with them and all he does is send them to their grave. At least in my eyes they are going to a much worse place (I'm a real pesimest with this place).
Anyways, thats a few of my stories and a bit of ranting. I don't think I can be a fish department taker carer ofer for ever, especially when I can't control anything that goes on. But hey, money is money and at least I can do my best.