i dont know about ornatum or atros in particular but since they are wild caught they are gonna usually be more shy to begin with no matter what the fish type, to help i would just try and keep you face looking right into the tank when you feed them, like start a little bit away to where they are comfortable eating and then gradually get closer and closer each time you feed them until they are comfortable with eating with you right there and then they should associate you with food just like the other fish, but they are pretty closely related to festae and while there are some personable festae they are definitely a fish that minds their own business and dont really respond to owner interaction as much as some other fish so he may get braver with age but not ever truly be really personable