Discus originate in the mixed tropical waters of the Brazilian Amazon River of South America.The Amazon and its tributaries contain water described as either white, clear or black. It is in the areas where these waters "mix" that Discus(video)  are found.Today,the Discus is a favorite among experienced freshwater aquarists and does very well in planted aquariums.Because of their unique shape, temperament, and wide variety of beautiful colors, Discus Fish are considered to be the most desirable aquarium fish by many aquarists. Discus will often grow to be over 5" in diameter in an aquarium.Discus naturally live in water at a temperature of about 78 to 84 degrees F. with a pH of about 4.2 to 6 containing very little dissolved salt and minerals. Sometimes the pH is higher, but Discus prefer the warm rainwater of the rainforest.Discus eat small worms, crustaceans, insects, and some bits of plant matter. In aquariums it is best to feed them frozen or live brine shrimp, some frozen or live blood worms, and live Black Worms. Sometimes Discus will eat floating flake food, which is very beneficial.