Oh thats how I purchased my four red-belly Pacu.
The guy insisted they were Tinfoil Barbs (little did he know, I had a very large TinFoil at home at that moment, probably ripping plants out of the ground and splashing water on the walls.) After 20 minutes of trying to set him straight, I decided to buy all 4 Pacu they had at that Walmart so some poor guy wouldnt by some "Tinfoil Barb" and have a really quick expensive problem... That...and my love for Pacu, and they were only $1.88!
Its funny how hardheaded some people are.