I've read that adult males are territorial and may become very aggressive, mainly with surface-dwelling fishes, and especially other males of the same species. I think they look awesome alone (as I keep my little male). A pair or a trio (1 m 2 f) should work well too. As Guppy said, a bigger group may prove useful, especially if you get an aggressive male. It diffuses the beating. 
Mine loves to eat little cockroaches, and he eats floating pellets too. Anything that keeps near the surface may be eaten. I really love these "mini-arowanas".
Best regards.
Daniel.
Mine loves to eat little cockroaches, and he eats floating pellets too. Anything that keeps near the surface may be eaten. I really love these "mini-arowanas".
Best regards.
Daniel.

