I thought I would put this up since suggestions are often made or people say they want to get this fish or that fish which comes out of South America. Take a look at this link and look down through the fish. Yes they are all wild caught....but that doesn't mean they don't get that large in a domestic environment because they most certainly will. These fish get large, and if you can't provide a suitable environment for them, in many cases 800gal or larger tanks, please do not purchase these fish. It will save you a huge headache, and you won't have to see the fish suffer in its too small enclosure.
http://www.acuteangling.com/Reference/SAFishArt.html
http://www.acuteangling.com/Reference/SAFishArt.html