So make sure that their water is free from chlorine and other toxic chemicals, as well as heavy metals. 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. 50 percent of the water should be changed every week and you have to keep the water free from chlorine and heavy metals. To do this, a water purifier will be able to do the trick. Keep in mind that Discus Fish thrives in the Amazon River basin where the water is slightly acidic and soft. So, keep the PH level of the water lower than normal. You need to keep in mind that unlike other fishes that needs no specific water condition to thrive, discus fish will need to live in special tanks with water that is specifically treated to the point that it mimics their natural environment. 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. A good diet must be a varied diet, which can include some blood worms, beef heart, tetra pieces, and some frozen or fresh brine shrimp. Remember not to over feed them and to clean any leftover food. If left inside the tank, the food can turn the water and sicken the discus fish. And with any fish, the water is the most important. They thrive in streams and lakes surrounding the Amazon River. They also come from the cichid family of fish and they like deep water. For this reason alone, you may want to get the largest and deepest aquarium that your home and budget can allow. You also have to remember that discus fish are social creatures. This is not distinguishable when the discus fish are still young, you can only notice this when they are in their adult stage. 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.