I dont know anything about these fish specifically, but from my experience with agressive fish, Ive found that the specific fish you choose and its environment is more important than the species. Peoploe say lungfish will attack other, smaller fish, andmine has yet to bother anybody, and he is 2' long. Also, I have had a few different oscars, and some kill other fish, while others are the biggest pansies around. I also have a giant gourami that has become tank boss, even though he is not the biggest fish, nor the most agressive species. So I would say try it out, and the worst that can happen is you have to move hm to a tank with fish bigger than him or make him a specimen fish in his own tank