But, with some proper guidance, you will be able to start breeding Discus Fish which you can keep or you can even sell for profit. We all know for a fact that taking care of Discus Fish can get quite expensive. This is why you need to breed them especially if you are a Discus Fish enthusiast. You need to know that Discus Fish are great breeders and in some instances, you will see that they will breed in your tank without you even knowing about it. The water temperature, acidity, and hardness should be stable enough and it should mimic the water in a discus fish s natural environment. You should also keep the water clean. So, try to change 50 percent of the water at least once a week and make sure that whenever you feed your discus fish, you need to clean or remove uneaten fish food. Emaciation can also occur and is also considered as a common symptom of internal parasite. A dose of Metronidazole usually clears the problem. You can get this ingested by your discus fish by medicating the food they eat. Feed your discus fish with medicated food every 2 days for a period of 10 days. If your breathing in thick smog all the time then it s a certainty that you would get sick, maybe develop cancer, or even choke to death in an instant. So, in maintaining the water of your tank, you not only need to keep it clean, you also have to get the right pH levels and the proper temperature which will simulate the waters where the discus fish came from, which is the Amazon river. If left inside the tank, the food can turn the water and sicken the discus fish. And with any fish, the water is the most important. This is their habitat; it should be kept clean at all times. With the discus fish, being that they originate from the Amazon River where there is a warm climate, the water inside your tank should simulate the temperature which is round 25-30 degrees Celsius. Get a couple of these fishes and they will be able to help keep your tank clean. Although Angelfish can look great with the discus fish, it is not recommended for smaller discus fish tanks. This is because Angelfish can grow very large and can bully the discus fish. They may even outcompete the discus fish for food and they may also carry diseases that the discus fish are prone to catch.