There is a reason for the high price tag of adult or show sized discus. The amount of time it will take for you to feed and grow up a fish to that size , you are better off paying the price for an adult fish. Discus needs lots of food and lots of water changes when they are growing, if both are not provided you will end up with stunted fish. The amount of work that it takes to raise discus from fry to adult size is not for everyone, and becomes very time consuming and expensive if you consider the amount of water, electricity and food required to get them to that size. You can buy some good quality juvies from a good breeder for a decent price and you can grow them out to adults with proper care. The important thing is to get good quality stock. If discus are provided with very warm water, clean water and lots of good food, they are as easy to keep as any other fish, and will provide you with many years of enjoyment. One day when i retire i would love to own them again, but only with an automatic waterchange system installed in my fishroom.