Black spots can be normal signs of growth called peppering. The really expensive Discus are pepper free and pure in colors. The "mixed" breeds tend to be more peppered. This is also common in certain strains like Pigeon bloods...etc.
A forum community dedicated to Aquarium owners and enthusiasts. Come join the discussion about collections, displays, product reviews, accessories, classifieds, breeding, health, behavior, housing, care, and more!