That's terrible. The walmart near me is a dirty, poorly run store even outside of the fish section. Their aquariums look as if they don't get cleaned ever, and you can clearly see the fish are sick. Which would deter buyers.
I am not fish expert. I am just a beginner. Paul is my first fish aside from three goldfish I had when I was like 5 that I won at a carnival. I only know the names of a few species. The last time I was at the walmart, there was a dead fish of some sort. I don;t know what species, but it was rotting in a 10 or 15 gallon tank with no less than 10 other fish in there. THe corpse was being consumed by a literal hoard of some kind of catfish. It was terrifying. Not somethng I would want my child to see.
My place it too small, but if I had a bigger one, I would get a 25 gallon and divide it so I could buy more of their bettas. When I got paul, his tiny cup was so cloudy. He was frisky though. Still is..even more so... He is a comedian. I don;t regret getting him. Even if he turned out to be really sick. I don't think I would regret it.