They are freshwater fish native to the Amazon River basin and are very popular as aquarium fish. In fact, Discus Fish are so popular that in several Asian countries, breeding this kind of fish is a major industry. However, the problem with Discus fish is that they are very hard to keep. They are very sensitive to water quality and also to the type of food they eat. You can feed the discus fish with frozen bloodworms and brine shrimp. Adult discus fish can be fed once a day but juvenile ones should be fed at least 3 times a day. These are some of the factors that you need to know when you plan on caring for discus fish. By following these tips, you can be sure that you will be able to properly raise discus fish and get them to thrive in your aquarium. The smallest size for at least 6 discus fish would be a 40 gallon tank. When you get a new discus fish, you have to quarantine them before you place them on your main tank. This is to prevent them from introducing bacteria, parasites, as well as other types of diseases that can be transferred to other fishes inside the main tank. You have to keep in mind that even if the fish heals after the treatment, the wound can leave a permanent scar, which can significantly have an effect on the overall appearance of the fish, especially on discus fish. This is why treating the wound while it s still small is highly recommended. For this kind of disease, you may want to treat the disease by increasing the water temperature from 30 degrees Celsius to 36 degrees Celsius. Because Discus Fish thrives on a more acidic type of water, you have to keep the water PH level between 5.5 and 6.8. Discus fish will not tolerate water with a higher PH level. The hardness of the water should be between 2 and 8 and the conductivity should be around 10ms. This may be a problem if you live in a place where hard water is abundant as you will need to bring down the hardness of the water as well as the PH. Keeping a Discus Fish aquarium is a lot of fun. However, you have to remember that you need to treat them differently than other types of freshwater fishes as these species are considered to be high maintenance and that they need to be watched over constantly. Keeping Discus Fish are quite easy to do.