hikari is a great food. i use that and some high protien pellets i got from a pond pellet source. my pellets are a 45% protien catfish pellet. i also recomend the seafood. verioty is never a bad thing. the more they have for options the better they will be. a aro will fast, but i have found with the mix of foods they dont fast with my experience as much. so fish will only take some foods and will never take others. in the end try all amd feed your aro what it wants. that way it can be healthy and you wont waste money.
i have a lng that wont take anything but pellets and live. i am working with some aros right now that only want fd bloodworms.