Arowana in Community

[Nickl117]

Hey all, I have a cycled and established 60 gal with a 4 inch ornate bichir, 4 inch black ghost knife and several coreys and mollies etc. there's a significant amount of open space towards the top of the tank and I just ordered a silver arowana from a local fish store. The smallest they had. How can I lower the number of fish casualties my tank will suffer with this new fish? I really like this fish and if it ends up eating smaller coreys or tetras I won't be too upset. However I would like my bichir to stay alive. Any tips? And yes I will get a bigger tank when the aro gets too big as well as the bichir