I would get a about 3 or four reddevil cichlids.They have the best fish personality.Mine allows me to pet it.They are also one of the most agressive cichlids but this is just a idea.They have a lifespan of at least ten years if properly tooken care of.In a 200 or 200 gallon tank they will get at least 12 inches maybe.
i suggest a cichlid community tank its very entertaining to watch them grow up and fight for territory spawn and interact in general.there will be some fatalities along the way but in a tank that big with lots of hiding places and a little overstocked it should spread out the aggresion lots to look at somthing always going down u would love it lol.