Some advice about Wal-Mart fish:
Quarantine them for at least a week. They tend to show signs of ich within the first week, so if you have them seperated from all your others, you can treat them and keep the others from getting it.
I have gotten all of my fish from Wal-Mart. I got all of my frogs there too. I've only had one frog die, but I've had like 7 fish from there die. None of them lived longer than one month. Some of the fish was probably due to my ignorance about cycling, but not all of them. And the frog, I don't have a clue why it died. I think it was sick when I got it.