Auratus in nature is a substrate picker, it grazes in algae covered rock areas eating algae, and the small animals that live in that grazing area. It is not normal for them to go to the surface for food.
Note where their mouth is located, it gives a clue (being lower area of the jaw) of how it normally eats.
None of this says that it can't learn to eat from the surface, but it is quite an unnatural shift.
They would do better with sinking pellets, and algae covered rock.
The fish below is "not auratus" but has a similar natural trophic bent.
Just an add-on, you can usually tell by looking at any fishes mouth the preferred feeding method.
The fish below are natural surface feeders.
Betta albimarginatta above, below Fundulopanchax sjoestedti
Even some cichlids
But looking at the ones below, you can tell coming to the surface, is a bit unnatural, and since the enemies of most cichlids are birds, a very risky move.
Cribroheros rostratum above, Paraneetroplus gibbiceps below