OK so it wasn't Petsmart but that franchise is a bit limited north of the border. Anyway, I was in a Petland a few years ago and came across what I though was the coolest fish I ever saw. It was a weather loach. At the time I had no clue about this fish other than it was neat looking and I wanted it. Also discovered that it could be housed in a goldfish tank or, as it's housed now, in with my clown loaches. Currently that same loach plays with the clown loaches and is a very healthy 6.5 inches long. Though it may not be a rare fish I just thought it very interesting to have found it and have yet to find another pet store here that even carries them.