What a cute little guy! He is gorgeous! Don't worry too much about him not eating yet, my lil guy did that!
Obviously every fish is different, but in the two weeks I've had mine, this is what he has eaten so far:
Mussel - Carefully dropped near him so that he doesn't have to go down for it, you will eventually find a small bit that floats if you rip it up.
HIkari Cichlid Gold Floating - He LOVES these.
Raw Petit Pois Peas - any peas will do but that's what I had to hand.
Crickets - Small, obviously.
Mealworms - The white ones are better because there's no hard shell that can cause injury, you will eventually find some that float.
Frozen Bloodworms - Some will float, get the vitamin enriched ones if you can get them where you are.
I'm glad your guy ate some bloodworms, that's a great start!! Mine has roughly grown an inch in two weeks. Heads up to the quick growth!! My Arowana is a Silver, but I guess they may have the same sort of taste.