When it comes to discus fish care, it can be a quite complicated task to make sure that you fish are happy and healthy and getting everything that they need, discus fish are not really recommended for beginner aquarists but if you would like to give it a try, then there are some important factors that you should consider when it comes to discus fish care, and one of the most important factors in the health of a discus fish is the water. fish come from the Amazon River and so they are used to warmer and more acidic water types. The ideal temperature for a discus water tank should be around 26-31 C for adult fish and for baby discus and young discus fish, the ideal temperature of the water should be kept at 31 C. it is important for the water to be soft and acidic with a pH lever of between 5.5 and 6.5, and this is an ideal pH level for wild caught fish to maintain their health. Many aquarists think that the water in a discus fish tank should be changed often (this is the same with any fish tank) but if you maintain a well planted tank that includes adequate filtration, lighting and bottom dwelling fish to clean up the mess that discus leave behind after eating, then this should keep the tank a lot cleaner and the water clearer for longer and you can simply top up the tank every other day with RO water. When it comes to the plants and other fish that you decide to keep in the water with your fish, you should choose fish and plants to compliment the discus so that they are able to thrive and do well.