I bought 2 arowana's from a LFS. One of the arowana is doing fine, but the other one won't eat (btw it also was sick from ammonia, which has been solved and doing well again). I have tried feeding it glassworms, Hikari sticks, and also feeder guppies, but it has denied all of them. The LFS said they fed it hikari sticks and also glassworms. It doesn't seem to be stress or sick. In fact it is very active, just not eatting.