When I worked at my local Petsmart , we had a pretty good Fish department. Partly due to me vetoing customers bad ideas. But one day when I was off, a new employee, who meant well, sold a customer our Planted Tank kit , I think a 30g. But they got confused and sold the lady LIVE SAND from our SW
Plants died, tank looked crappy. We let her return everything and I started her over with Eco Complete and a new tank.
Our Planted Tank substrates were quite near the Live Sand and lots of customers grabbed SW
stuff by accident over the years. Too rushed to pay attention.
In the employee's defense , this customer came in right at closing and was in a hurry. Tank was a gift. I got it straightened out. Educated the employee. Tried to educate the customer.
I heard a lot of idiotic opinions over the years.
A lady complained because I refused to sell her a Bala Shark for a 10g. Single baby Balas tend to panic and hit the sides and die, esp, in small bare tanks. She swore she'd buy a bigger tank "later".
I stopped letting people put Goldfish in bowls. Even Bettas I sold 2.5g tanks as a preferred minimum.
One man swore Angels were fine in 10g.
One employee tried to tell me Bettas NEEDED small spaces ( yes, he is still alive, but I may have ripped his ego up a bit ).
Lots of odd ideas about live plants.
People wanting to add the "pretty" Cichlids to their Goldfish tanks *shudder*
Ooo the best was a man walked in and said he wanted to buy our tank of red wag Platies.
He wanted the display tank !!! The one that is part of the WALL of tanks and NOT removable !
I explained the "tank" was almost 1,000 gallons and he was just looking at a small divided section. He then wanted a 10g with the entire stock of Platies. Trying to explain he could have 2 fish, not 20, was not easy. Explaining holding tank vs home tank was a battle. I finally took this stubborn guy in back and showed him the massive sand bed filter and sump for the "Platy tank ".
I asked him to buy a book, Google some info and then come back. Fish are not just decor for the livingroom !