Before we move deeper into finding an answer to this question, let us understand one important fact. Discus fish actually originated from the Amazon River in South America where it is close to brackish water. The water condition located at this region is generally hard water and is slightly acidic in pH due to presence of humic acid. And because the river is located at tropical area, you would expect the water temperature to be slightly higher than normal which should be around 26 to 30 degree Celsius.
If you intend to successfully breed your discus, first let’s take a look on how to prepare the right living condition for your pets. Other than good water quality, which will avoid unnecessary stress level, it is best that the water quality should be as close as possible to what we have mentioned earlier. What I would recommend is that try to create the same natural environment similar like in the wild and your fish is bound to love it. Try to decorate and plant as many different tropical plants as possible so that not only the water is fresh and rich in oxygen but also your discus will also find a lot of hiding places to make them feel secure.
In order to create a slightly acidic environment, try to avoid having leftover foods in the tank that will cause the pH level to increase. Make sure that there are no dead leaves or fish, which can cause huge amount of ammonia buildup and thus cause the water to be alkaline. If possible, try to conduct water changes at least once every 3 days depending on overall tank cleanliness and if you have water filter that takes care of the filtration, that would be the best. If everything fails, what you can do is to buy some of the liquid pH adjuster and follow the recommendations on how to shift the pH suitable for your discus fish to live in.
For the temperature control, this can prove to be even easier because what you need is actually an aquarium heater. Make sure that water temperature does not change too rapidly or else the fish will be subjected to unnecessary stress. As an owner who wants to see the fish getting the best tank water condition, be prepared to spend on the equipment and put in the hours to look after them.