Dont attempt starving a arowana until it is at least 10 inches long, until then just feed it what ever it will eat. After that give the fish one good feed and then dont offer anything but pellets for 4 weeks, by the end of the second week it should start to eat them.
Mine eats pellets and frozen foods. Never seen feeders in its life. I watched it for a few months at the LFS, they had it eating dry foods and crickets.
I'd suggest feeding it crickets and live earthworms for a while. They maybe throw in a couple chunks of shrimp or fish. And you can soak pellets in shrimp juice or fish juice to make them more palatable.