So that you wouldn t be bothered of cleaning your tank or changing the water often, you could add some sufficient filtration system, some lighting, or maintain some bottom dwelling fish to help clean up the tank. If you don t know yet how to maintain the temperature and pH levels of your tank water, then it is not recommended for you to own a discus fish yet. And, they really won t tolerate sudden and large water quality changes. Small fish tanks will likely fluctuate when it comes to the water pH level as well as the temperature. This is why larger fish tanks are recommended for discus fish. The smallest size for at least 6 discus fish would be a 40 gallon tank. Many homeowners which have aquariums in their houses swear to the fact that aquariums provides them with a sense of calmness, but of course, the fish inside the tank does a lot to make this happen. And one of the most sought after tropical freshwater fish today is the discus fish. A lot of discus fish owners today have seen the great potential in making money of their pets. The 2 Things that you Should Concentrate on When Discus Fish Keeping When talking about the health of the discus fish, there are really only two main aspects where great concern should be focused on. These two will dictate highly whether your discus fish will be able to spawn or let alone be healthy and live a long life. This will subject your discus fish with high levels of stress, which will eventually cause them to get sick. Discus fish needs clean water and good nutrition in order to thrive. When you are putting tap water in your aquarium, make sure that the water is treated first before you place the discus fish inside. 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. If you don t know how to keep a Discus Fish, then you have to first educate yourself how in order for you to continue enjoying having this fish in your aquarium for many years to come.