Usually, mega stores with that look, that many tanks and that long a history (I've heard of them a couple of times on forums, going back a ways) will have some of the less popular commercially produced tetras, barbs and Rasbora types. There are a lot of farm produced tetras that rarely get into the North American market because the box stores have limited ordering practices. They end up in Europe or Asia.
I've noticed larger stores that aren't corporate tend to order a few oddballs to differentiate themselves, and there are sometimes good surprises.
I don't recall what people said about the store, but it has a distinctive name that sticks in your mind. I don't remember any negatives though. Where I lived in the 90s, there was a comparably sized store that got really good fish species in, but it was sold to very dumb owners (they ran undergravel filters but didn't have gravel....) and it crashed out of the market in record time. That's always the issue with established quality stores - ownership changes.