Our Guide To Keeping Cobalt Blue Discus Fish

1. About Fish Species:

   • Scientific name: Symphysodon aequifasciatus
   • Common name: Cobalt Blue Discus
   • Family: Cichlidae
   • Origin: Amazon River Basin in South America
   • Adult length: 15 to 20 cm
   • Lifespan: 8 to 10 years
   • Diet: Omnivore
   • Care Level: Advanced
   • Temperament: Peaceful

2. Tank Setup:

   • Cobalt Blue Discus require a spacious, mature aquarium with excellent water quality and stable conditions. A minimum tank size of 250L is recommended for a small group, although larger aquariums are preferred.
   • Provide a calm, well-planted setup with open swimming areas, smooth driftwood, broad-leaved plants, and subdued lighting. Discus do best in peaceful aquariums without strong currents or aggressive tank mates.

3. Water Parameters:

   • Cobalt Blue Discus thrive in warm, soft, slightly acidic to neutral water, with a pH range of 6.0 to 7.0 being ideal for long-term care.
   • Keep the water temperature between 28 to 30°C (82 to 86°F), as discus require warmer conditions than many standard community fish.
   • Maintain very clean water with low nitrate levels, and avoid sudden changes in temperature, pH, or hardness.

4. Filtration and Water Flow:

   • Use a high-quality filter that provides excellent biological filtration while keeping the water flow gentle to moderate.
   • Cobalt Blue Discus prefer calm water, so avoid strong currents that may cause stress or force them to constantly swim against the flow.
   • Regular water changes are important, especially in heavily stocked aquariums or when feeding rich frozen foods.

5. Diet:

   • Cobalt Blue Discus are omnivores and should be offered a varied, high-quality diet to maintain strong colour, growth, and condition.
   • Feed a mixture of quality discus granules, soft sinking pellets, frozen bloodworms, brine shrimp, mysis shrimp, and specialist discus foods.
   • Offer smaller feeds several times a day rather than one large meal, and remove uneaten food to help maintain excellent water quality.

6. Tank mates:

   • Cobalt Blue Discus are peaceful cichlids and should be kept with calm, non-aggressive species that can tolerate warmer water conditions.
   • Suitable tank mates may include Cardinal Tetras, Rummy Nose Tetras, peaceful Corydoras species that tolerate warmer temperatures, Sterbai Corydoras, small peaceful plecos, and other discus.
   • Avoid boisterous, fast-feeding, aggressive, or fin-nipping fish, as these can outcompete or stress discus.

7. Behavior and Compatibility:

   • Cobalt Blue Discus are social fish and are best kept in groups of at least five or six individuals, unless keeping a bonded breeding pair.
   • They can become shy or stressed if kept alone or with unsuitable tank mates, so a calm aquarium environment is important.
   • Discus may form hierarchies within a group, but serious aggression is usually reduced when they are kept in a properly sized aquarium with enough individuals.