If you notice that your tank s water is getting dirty, you should change it. You should always clean your tank of leftover food. 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. You need to remember that juvenile Discus Fish are far more sensitive to water quality and food quality than adult Discus Fish. You also have to know about the dealer quarantine. This is the time where the dealer obtained the fish and the time they decide to sell the fish. The longer the dealer quarantine is, the better it will be for you. So only go to a trusted dealer. An adult discus fish is much more expensive because you re paying for the convenience. You don t have to wait anymore for them to grow up and you already get a head start at breeding the discus fish. So only go to a trusted dealer to ensure that you will indeed end up with a pair. You have to keep in mind that discus fish are quite sensitive to disease and water conditions. 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. They may even outcompete the discus fish for food and they may also carry diseases that the discus fish are prone to catch. This combination is possible but it will require a much larger aquarium and also a skilled aquarist. Another great fish that can complement your discus fish is the Blue Ram, which is a beautiful dwarf cichlid. When you are putting tap water in your aquarium, make sure that the water is treated first before you place the discus fish inside. This is to ensure that the water is free from chemicals, such as chlorine and other heavy metals. Discus fish lives naturally in soft water that is slightly acidic. When it comes to feeding, make sure that you don t over feed them.