I know its risky adding more than one Arowana to a setup unless you have a very large group. I recently ordered four 6-7 inch silver aros from PetZoneSD which should arrive tomorrow. If fighting starts, I have separate aquariums however id like to achieve a large group of silvers in the long run. How exactly is this achieved, and how do you think my small group with react? Any tips? How should the aquarium be decorated, should I provide hiding spots? I have a large tank but in your opinion what would be the correct size aquarium that would last these four fish for two months?