I don't think they should be banned. They just shouldn't be available for 5 bucks. Take rays for example. They are rare and expensive, so more often than not, the proper research is done before dropping that much coin on a fish. If pacus weren't affordable by any moron that can afford a ten gallon tank, I'm sure there would be far fewer that were mistreated. Same goes for RTCs, TSNs, aros, ID sharks, etc. Common myths are part of the problem, too. Like "a fish will grow to the size of it's tank". Where did that even come from?