Discus Fish Care Guide

Discus fish are admired for their round body shape, graceful movement and remarkable colours. They are not difficult to keep when their aquarium is mature, warm, clean and stable. This beginner’s guide explains the essential conditions needed to keep captive-bred Discus healthy and comfortable. Discus Care at a Glance Care level: Intermediate Temperament: Peaceful and social Adult size: Approximately 15–20 cm Recommended group: At least 5–6 Discus Temperature: 28–30°C pH: Approximately 6.5–7.5 for most captive-bred Discus Ammonia and nitrite: 0 ppm Nitrate: Preferably below 20 ppm Diet: High-quality pellets, frozen foods and suitable protein-rich foods Are Discus Fish Suitable for Beginner A well-prepared beginner can successfully keep Discus. Their main requirement is stability. Sudden changes in temperature, pH, water hardness or water quality are more dangerous than a parameter that is slightly outside an “ideal” number. Set up and fully cycle the aquarium before purchasing fish. Never add Discus to a newly filled or biologically immature tank. Choosing the Correct Aquarium Size Discus are social fish and should normally be kept in a group. A small group spreads natural social behavior and reduces the chances of stress. Plan approximately 40 litres of water per adult Discus. A group of 5–6 young Discus should ideally start in an aquarium of approximately 200–250 litres or larger. Taller aquariums suit their body shape, while sufficient length provides swimming space. Avoid overcrowding unless the aquarium has excellent filtration and a disciplined maintenance schedule. Temperature: Maintain 28–30°C with a reliable heater and separate thermometer. pH: Around 6.5–7.5 is suitable for most captive-bred Discus. Avoid rapidly adjusting pH with chemicals. Ammonia: 0 ppm Nitrite: 0 ppm Nitrate: Keep below 20 ppm wherever possible. Hardness and TDS: Soft to moderately mineralised water is normally suitable. Match the breeder’s water gradually and prioritise stability. Test the aquarium especially after adding fish, changing food quantity or cleaning filtration equipment. Filtration and Aquarium Setup Discus produce a considerable amount of waste because they are fed frequently. Use dependable biological and mechanical filtration with gentle, well-distributed water movement. Aim for approximately 4–6 aquarium turnovers per hour, adjusted for the filter and aquascape. Use mature biological media to process ammonia and nitrite. Remove trapped waste before it decomposes. Provide good oxygenation, particularly because warm water holds less dissolved oxygen. Keep the intake protected and avoid a powerful current directly across the swimming area. Bare-bottom aquariums are easier to clean and are commonly used for growing young Discus. Planted aquariums can also work well when plants tolerate warm water and the layout leaves open swimming space. Feeding Discus Fish Offer a varied diet instead of relying on one food. High-quality Discus pellets can form the staple diet and may be supplemented with suitable frozen foods. Juveniles: Feed 3–5 small meals daily to support steady growth. Adults: Feed 2–3 controlled meals daily. Give only the amount the fish consume promptly. Remove leftover food to prevent ammonia and bacterial problems. Introduce any new food gradually. Observe every fish during feeding. A Discus that repeatedly refuses food, darkens or isolates itself may require closer inspection. Water Changes and Maintenance Regular water changes are one of the most important parts of Discus keeping. A practical starting schedule is a 30–50% water change two or three times per week, adjusted according to stocking density, feeding and nitrate levels. Match the replacement water temperature closely. Use a suitable water conditioner when using chlorinated tap water. Avoid large, sudden changes in pH or mineral content. Siphon waste from the bottom and clean mechanical filter material regularly. Do not replace or sterilise all biological media at the same time.