Discus fish are high maintenance types of fishes, which are very sensitive to water quality and food quality. You have to keep in mind that unlike most freshwater aquarium fishes, discus fish needs to be taken care of properly in order for them to grow healthy and happy even if they are not in their natural habitat. You should also keep in mind that discus fish may acquire different kinds of diseases. 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. When they reach adulthood, you will soon observe that if there is indeed a pair, both of them will soon claim a space in the tank, and start protecting it. This pair will then be your breeding pair. Have a breeding tank ready as soon as you discover them. 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. You should also keep it a good temperature and pH level. Investing in a dependable purifier, filter, and aerator will make the water clean and livable. Vary the diet of your discus fish. Aside from the flakes and granules, feed them blood worms or fresh or frozen brine shrimp as discus fish are carnivorous. 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. Just make sure that the discus fish are the largest fish in the tank. When it comes to their food, discus fish can be fed with aquarium foods. You have to remember that Discus Fish will not tolerate ammonia or nitrite in any amount. They will only be able to tolerate the bare minimum nitrite. You also need to make sure that the detritus is removed on a daily basis along with any uneaten food as this will produce ammonia in the water, which will potentially make the Discus Fish ill or possibly kill it.