So, you may want to get a large tank that is both wide and deep. Discus fish can grow up to 6 or even 7 inches. Now, because you have to have at least 6 discus fish together in the aquarium, you will definitely need a larger tank.
Although it is possible for you to keep discus fish in tanks that are empty, it’s best if you put in plants, bog wood, and rocks inside the tank. These will not only make the tank look a lot better but these things will serve as a hiding place for discus fish and it will also help keep them comfortable.
Discus fish are easily frightened and if they have nowhere to hide, they will get stressed easily and can possibly hurt themselves from dashing around the tank and hitting the glass.
The water is also an important factor. Make sure that you keep the pH level of the water at 6 and also the temperature at a constant 82 to 86 degrees F.