Discus Fish Care Guide: Water Quality, Diet, and Tank Setup

Discus are often called the “king of the aquarium” for their striking round profile and rich colors, and their reputation for being difficult mostly comes down to water quality demands.

Tank Size and Setup

Discus are a schooling fish and do best in groups of five or more in a tall tank of at least 55-75 gallons, giving them room to establish a comfortable social hierarchy.

Water Quality

Discus are sensitive to ammonia, nitrite, and nitrate, and prefer warmer water than most community fish — typically 82-86°F. Frequent water changes (twice weekly in many setups) are standard practice among experienced keepers. See Understanding Aquarium Water Parameters for testing basics.

Diet

A varied diet of high-quality discus-specific pellets, frozen bloodworms, and beef heart mix supports their color and growth. Feed small amounts multiple times a day rather than one large feeding.

Tank Mates

Discus are peaceful and pair well with other calm, warm-water-tolerant species like cardinal tetras and corydoras catfish. Avoid fast, aggressive tankmates that will outcompete them for food.

Getting Started

Browse our discus selection, including the Leopard Skin Discus, and make sure your tank is fully cycled (see How to Cycle a New Aquarium) before adding discus, since they are especially intolerant of ammonia spikes.