Discus do best in groups of 5+. They are also recently sensitive to water quality. For juvies anything under 3-4 inches you want to keep nitrate below 10ppm.
Getting new discus to eat, in my opinion, is the hardest part about keeping them. You should talk to the LFS or breeder to find out what they were eating before. Garlic guard will help if you need to feed them medication.
Discus also need water above 81F I keep mine at 83F.
Common practice is to grow out 5-8 juvies in a 55 with daily water changes.
As others have said they spook really easy. Causing stress. A low traffic area if the house is best for new discus.
The best scenario is that you move them to their own grow out tank and when they are adults at about 5inches reintroduce them to the community.