In the 70's (yes 1970's) I had four young Pinnatus in a 120 gal tank, by themselves. They learned to eat from my hand and were quite tame. Looking back it was just dumb luck. I kept them for four years and they doubled in size. As I was in school I donated them to a local aquarium where they lived for many more years and got to adult size. They have a lot of personality.
The batfish in the OP image is ill looking. It's color is bad and it is quite thin. Unless you have personally seen that fish eating, I would avoid it.
If tank raised ones are available, I would certainly go that route.
This is an image of a healthy Pinnatus in the wild.