DefinatlyLarge aggressive fish
I would a massive tank with arowana, oscars, all kinds of big catfish and ple*os, maybe a lungfish, bowfin, some gar maybe, a snakehead, some pacu , some piranha, an electric catfish, stingrays, a school of clown knifes, and even an arapraima(sp?). Then i would buy like 1000 feeder goldfish and drop them in. But i would also have seperate tanks set up so i could breed them all.... imagine how cool it would be to breed aros and snakeheads!
I do actually have plans to build a monster tank in the next year or so. My buddy and I are getting a 3 bedroom basement apartment and we have already made up our minds to turn the third bedroom into a fish room! Then some of my dreamtank gets to come true!