Secondly, and to some most importantly, your aquarium water should be strictly kept at a certain level, both in temperature and in pH level. You should also always keep your tank clean and soft, keep away heavy metals and invest in a good filtration system or purifying unit. Keep the water slow moving and with temperatures between 82 to 86 degrees Fahrenheit. 20 gallon fish tanks are perfect for 2 pairs of discus fish. But, if you are planning to breed several pairs, a larger fish tank may be needed. You also have to keep in mind that discus fish are social animals. They live in groups in their natural habitat, which is why you need to have at least 2 or 3 pairs of breeding discus fish in the breeding tank. 3 inches would be the best size to buy them. But, the odds are that in those six to eight young discus fish, you will be able to get at least a pair or two. The best thing about this option is that at this age, the discus fish doesn t command a high price yet. It will take some time though before you will be able to discover if you have hit the jackpot. Keep your aquarium in a quiet and solitary place. Too much noise and motion, like a door opening or heavy human traffic can cause them stress. Never overcrowd your tank. Discus fish are very protective of their space so they need an ample re to grow and breed. The bigger the tank, the better. Consistency is the key. By giving them the proper water condition they need to thrive, you can be sure that your discus fish will be able to live for a very long time and they will also be a lot healthier and more active. The temperature of the water must be kept stable. In their natural home, discus fish usually thrives in water with temperatures between the range of 28 and 31 degrees Celsius. During spawning, you will notice that the breeding tube of the male discus fish tends to be smaller and sharper, with the female, the breeding tube will be rounder, and broader. The breeding tube can be found between the anal fin and the anus. Some breeders say that the female discus fish have a more vibrant color, but there are fewer patterns.