In rec.aquaria.freshwater.cichlids NetMax wrote:
: All the hyper-aggressives I've seen were living in isolation because of
: their personality. I'd never known or seen isolation intentionally used to
: create a hyper-aggressive fish. If this is true, I hope it doesn't become
: common knowledge.

It sounded more like a description of how fighting pit bulls were raised
than of fish. Now, I can see if you take a typically aggressive fish that
has been living solo in a tank barely adequate for his needs and throw in
another fish how he might kill it. But that has more to do with not paying
attention to the territorial needs of the fish and the proper ways to
introduce adult territorial fish (particularly two males, who would be
rivals in the wild). If you raised them together since juvenials in the
same tank, there would probably still come a day that they beat the snot
out of each other once they get too big for the tank. It's just the nature
of cichlids, but I can see how someone less knowledgable who's been reading
too much about fighting pit bulls could make the mistake. Hint, the key
difference between dogs and cichlids: dogs are pack animals if properly
socialized as puppies, most cichlids are not.