If you want to keep them with other large aggressive fish then get a large tank 180+ and over-crowd it. When these fish are able to claim territory thats when they become violent. I'd go with a big bare tank with lots of large cichlids and let it roll. Hell i have a Butti,Red Devil, Jardini Arowana, Marble Pim Catfish,Ornate Bichir and 2 Mono Peacock Bass in my 180 and the fish sizes range from 5-7"..and everything is working well other then the RD and Jardini Harassing everyone but no major lip locking or bad fin damage. But who knows how long it last but its always worth a try and if things start going south just sell your fish to a LFS or a friend. GoodLuck to you...