This isn't about stupid customers in fish stores, but just stupid people I know that own fish.
I've given up on helping them, they will not listen.
One has a 20 gallon with a goldfish, pleco, silver dollar,12 misc. tetras, and 2 snails. She called me because she has a lot of algae in her tank and her fish keep dying. She leaves her tank light on 24/7. Changes water once a month. She wanted me to test her water.
I spent a lot of time with her, going over compatible fish, how big plecos, gold fish and silver dollars get, the difference between cold water and tropicals, the importance of a timer for the light, water changes, how scraping the algae off the tank sides is something most hobbiests do, etc. How the fish would appreciate a little decor, other than one plastic plant and a rock. Offered to help her design a tank that would work.
Her response: "So, I should get rid of my big pleco and get a new smaller pleco?" DUH! That one is going to grow too!
The second person had a 10 gallon that she tried to keep a betta in. I gave her a heater and a glass top, fish was always jumping out.
She had lava rock and sea shells for decor. Kept trying to put a female in, cause Wal-mart said it would be OK. Male kept killing his "mate", and she wanted to know why.
She wanted the fish to breed so her kid could see baby fish. For awhile she came to me with questions, but again, never listened, even turned me down when I said I'd re-do her tank FREE, with FREE stuff, make a betta paradise. She called and said the tank was too much work, so she put her betta in a bowl on the TV, but she still has to change the water every week because it smells gross!
WHY DO THESE TYPE OF PEOPLE EVEN HAVE FISH!