Very much an omnivore.
I feed mine tetra prima,flake,mussel meat,prawn,greens etc, like already said,these disc characins are not fussy, absolute opportunist scavengers in the wild.
bloodworm is good to get fussy feeders to take their first meal and is good to feed to suppliment the diet, however you will not get great growth rate by feeding this alone,pellets and granular foods contain far more nutritional value. So knock off the bloodworm asap and give them something more substantial, they grow alarmingly on the right diet.