What you have cannot be the same. You are confusing my two for sale threads. One thread is about Peruvian Scalares and this one i about the real Altums. Your fish cannot be both the same as the fish in the two threads because the fish in the two thread are different. Look at the pictures in the two threads, they are quite different in appearance.
Sorry to disappoint you but what you might have are silver angels which are quite common.
I suggest you research wild type angels. There are three accepted specie out there and each have distinctive features. The most common wild type angel is the Scalare and considered the source of all the different tank bred variants. Not as common are the Leopoldis. And the rarest of all and hardest to keep in tanks are the real Altums.