You need to consider the fact that this is very important whenever you intend on keeping any kind of fish in a fish tank or aquarium. If you don t know anything about the nitrogen cycle, then you may want to cancel your plans on keeping a Discus Fish. You have to remember that Discus Fish will not tolerate ammonia or nitrite in any amount. Discus fish tend to get stressed when the water experiences an abrupt change or if its dirty. The Don ts Don t allow your tank water to get dirty and filled with food debris at the bottom. Any debris left can cause bacteria to develop and make your fish ill. This then will hamper the breeding process. They may have problems with parasitic worms. You can observe their healthy by taking a look at their feces. Clear or white feces are hints that your discus fish may have internal parasites and that they are unwell and need attention. Also, you should observe their behavior. If your discus fish go on food strike, it s a clear sign that they are unwell. You also need to make sure that the aquarium is away from doors that could open. This is to prevent your Discus Fish from getting stressed. Always keep in mind that if the Discus Fish is always subjected to high levels of stress, they are more likely to get sick and die. Lastly, you have to remember to feed your Discus Fish with pellets, flakes and worms. Make sure that you keep the pH level of the water at 6 and also the temperature at a constant 82 to 86 degrees F. If you want to add other species of fish in the discus fish aquarium, make sure that you try adding catfish, plecs, small tetras, and other gently and slow moving fish from South America. You need to know that Discus Fish are great breeders and in some instances, you will see that they will breed in your tank without you even knowing about it. To start the breeding process, you may want to purchase a breeding pair. The dealer of the Discus Fish will be able to give you some options and pricing information to get you started in the breeding of Discus Fish.