Do best with other fast-growing, aggressive fish or fast-moving, fast-growing species like ID sharks, Tinfoil barbs, etc.
Aggressive, especially when they reach the 12-inch mark and are kept with their own species. My two occasionally bother my jag, while my previous one used to bully/fight with my oscars and a larger arowana.
I wouldn't say dumb, but they're not as intelligent as cichlids. They are escape artists and can easily find their way out of tanks and walk on land. They also like to explore their tank, caves, decorations, and establish territories.