One day in the next 10 years, I would like to setup a large tank that I would either get custom made, or make it myself with plywood. I would like to get silver arowana since arowanas seem like interesting fish and would like to get a asian arowana, but since they are illegal and jardinis are too aggressive, would a silver or black work? Would be a 72 inch, by 36 inch, by 24 inch tank I was thinking about?