Nice. My favorites are those in the top photo.
So say some people. Might be true of some of the weak breeding strains that are out there. But not at all true ime.
There are differing schools of thought on a number things about discus keeping. Half of them are myths imo, especially when someone insists it's the only way to do it. Or else they're a consequence of the unnatural way some people keep and feed discus, or possibly they're true of some of the weak, overbred strains that are out there these days. From my experience, healthy discus are much more robust than some people give them credit for being (and I've kept several strains, including wild).