They are only 2.5 " and no hormons at all. That's why they look more silver then blue or brown. These guys will look like differant fish once they start to grow.
Most of your lfs discus are from Asia and given hormons to bring out the color so they sell better. Not all Asia bred discus get hormons but it happens with some.
The yellow one is a pigeon Blood of some kind. He was my first and is almost a year old. He is about 4.5". He looked very dull when I first got him.