The aquariums in his shop are his livelyhood and if he's spending space on
fish that won't sell, he's not making money off that space, and that's bad
business. I had orangethroat and fantail darters, brindled madtom (set up
so you couldn't miss him), and some shiners for 8 months in my shop (because
I liked them) and the only interaction I got from customers was "what are
those?" and then they just moved on. No one asked "Are they for sale?",
"Where to get them?", "etc etc etc". They would just nod and go on.
People walk into a fish shop looking for something EXOTIC to buy.
Remember... NA Natives are always in the European books as appropriate