All the girls have that white granule. That's where the eggs come from. That, is decieving.
The reason for conditioning is mainly so that they have enough food, energy... This is basically having them in their own environment without other fish (no stress factor), and being fed a variety of good foods (live, frozen, freeze dried, flake/pellet). It really is tiresome for the fish to breed. The male especially, usually is not fed when caring for a nest, so he definitely needs to have the nutrition beforehand!