There's nothing really special about feeding them.
We did have what I believe to be a baby warmouth in there with them, and they'd all hover around together. He learned from the bottom feeders to go to the bottom and get food. Of course we don't have him anymore, our sculpin ate him, that happened to a lot of the smaller fish in there.
Shadowbass don't seem to eat off the bottom, if food floats in front of them they gobble it up, they're mostly middle water eaters, however they will go to the top and eat food floating up there. They will only get food from the bottom if they notice it moving or another fish goes to pick it up.
Ours eat mostly hikari carnivore pellets, that seems to be their favorite, they swallow the pellets whole. I think yours is too small for that though. They also eat a lot of krill. They get feeders every once in awhile, it's fun to watch them hunt.
Basically anything that floats in front of them they'll try to eat, you kind of have to experiment to see what they like though.
I'm not sure how their behavior is with just one of them, since we have 5. Ours rush the front of the glass when we come near, they're very similar to cichlids. They can change color at will, from so white you can see their organs, to jet black. Color is strongly dependent on competition and food. If they're hunting they get a very bold pattern, much like in your picture but a lot darker. If they're battling for dominance the pattern changes rapidly, the dominant fish stay nearly black usually.
That is about what they look like when hunting, though not a very good pic.

If you click the link you can see one to the right of my hi-fin, they can be much darker than that, but that is the coloring of the more dominant fish much of the time.

There's one begging for food.
Very interesting fish. I don't think you get the full display with less than 3 fish though.