Discus fish prefer large tall tanks and I would recommend a minimum of 55 gallons (200L). As for the setup, it entirely depends on the purpose. If for breeding, it is best for the tank to be bare bottom, meaning without any gravel. However, if you want a show tank then it is best to emulate the natural habitat of the Discus fish by provide hiding places, open swimming areas, driftwood, fully planted aquascape and some floating plants to diffuse the light.
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