i went to wal-mart today and walked through the fish department(out of habit)and looked in the tiny betta cups,i saw a betta in the dirtiest cup that had severly torn fins,i picked up the cup and another betta shot from the other side and began attacking the other betta!i got a person that worked in the fish area to come,she said that he was in there because they didnt have any more cups!so she put one of the bettas in one of thier empy tanks without getting him used to the different temperatures.the poor baby had barely any fins left,the betta that was doing all the attacking didnt have that much damage...........i try not to even go in there anymore,this is the first time i've been there for about two months.