Hi Hidan, it would have been best to have QT the discus for six weeks before moving them into the main tank. Be sure to watch the ammonia as you will most likely have a min-cycle so keep up with daily 50% or better water changes. Ask the breeder what he was feeding. I see the three cobalts, one blue diamond (barless), three yellows (golden melons?) and not sure about the three showing the strongest barring.
Pat