Yeah you can, I don't know why you would want to, but it is possible.
The only person around here who has an arowana has it with 3 huge goldfish in a 240. The goldfish were feeders but it never ate them and he conditioned the aro onto other foods and uses goldfish as a treat every now and then. But none the less, the fish is over a couple years old and the goldfish are from the first batch. Its a silver by the way (I doubt you could keep them with jardinis).