Keep the water temperature raised for around 8 to 10 days. By increasing the water temperature, you also need to increase water aeration to keep the oxygen level up. You can also combine heat treatment with Metronidazole, which is administered orally. Give this medication to your discus fish once every 3 days. A breeding tank should be separate from the main tank so as to protect the spawn, at the least; your breeding tank should be 20 gallons. When you have finally established your discus fish breeding tank, transfer some of the water from your original tank, this will prevent your discus fish from experiencing stress in being exposed to a new tank. This is a great option for people who are just starting out keeping and breeding Discus Fish as they are less expensive. You will be able to tell that which pair is the mating pair. Discus Fish will establish territory within the aquarium and you will see them defending it against the other fish in the tank. First off, you need to make sure that you have a pair, a male and a female discus fish, that is the most obvious part. To go about it, there are three viable options for you, but to be honest, some of these options may not be the best way to do so. Here are your options: First, is to buy young discus fish, bout six to eight of them. Before anything else, there are many advantages in owning a pet fish. First you won t need to take them for walks, you don t have to give them baths, they don t demand much attention, and you don t really have to clean up after them after every while. Yes they still need some looking after but not as much as compared to our canine and feline friends. The acidity of the water should also be kept at a constant level. The water pH for discus fish to thrive in should be between 5.5 and 7. Any more acidic or alkaline than these numbers is a sure way to kill your discus fish. Lastly, the water hardness should also be considered. Although discus fish are not that sensitive to water hardness, it will play an important role in keeping them healthy.