I want a mbu puffer and want to keep a arowana with it with some other fish. I think it was done before. Also is it illegal to bring arowanas into another counry or is it only gold arowana's?
Some Mbus are nice and others are not. They tend to be less aggressive than the smaller fw puffers, but I wouldn't chance it. Aros can be really expensive. Besides, it would require a huge tank (like in the 400 gallon range)
Like everybody else stated, it all depends on the fishes personality. Its been done before, BUT its really risky and you must keep an eye on the tank constantly. Even thou you find a combo that works the fish could snap at any moment. Hardest thing to do will be to find one that is fish friendly and at a size thats comparable. Heres a combo I did awhile back!