Home » Animal » Blue Diamond Discus Blue Diamond Discus 1 Discus, Freshwater Fish Latin name: (Symphysodon sp.) Care Level Moderate Temperament Peaceful Color(s) Blue Diet Carnivore Preferred Conditions Moderate Avg. Max Size 8" Minimum Tank Size 55 gallons Family Cichlidae The Blue Diamond Discus is a peaceful fish that requires an advanced level of care due to its feeding habits and water filtration requirements. Territorial during spawning, this discus forms a well-defined nuclear family.