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If you want care the fish, you should:

Provide a large tank at least 48 gallon tank.
The discuss need low Ph water (ph 5 to 6), warm water ( 81- 91 F) and soft water degree (3-15 dH)
Use dim light to your aquarium
The fish is very sensitive to water change instantaneously. You need to replace 20% water a week
Install water filter to keep the water clean. You may complete the tank with aerator
You may facilitate water heater to keep water warm
Buy a health discus for your aquarium. The discus should be active and well eating.