You should equip your aquarium with different corals or coral like ornaments which the discus fish can hide in or at least have some privacy. If these are not available, you can buy some potted plants. These are also good places where the fish can spawn. You should also keep your tank in a quiet area in your home away from noise so as not to startle the fish. The male discus fish is more aggressive, they tend to come between the female and any intruder to protect the female discus fish. Also, the male tends to be larger and has a bigger forehead. In the female discus fish, the dorsal fin will seem to be rounded, while in the male, it will look more pointed. Before, because of its limited supply, only a selected few would be able to get their hands on a discus fish, let alone a handful of them, luckily today, many are now able to get their hands on them, and if you re one of those lucky persons, then you should know how to provide them a good environment so that they can leave healthy and stress free. A large school of characins, such as the Cardinal Tetra, Rummy Nose, or the Neon Tetras go well with discus fish. This will also help emulate their natural habitat more and both types of fishes flourish well in the same water conditions. You can also include most peaceful and slow moving South American fish as well as Dwarf Cichlids with the discus fish. You also have to keep in mind that the hardness and acidity of water is also important. You need to be able to mimic the waters of the Amazon River in order for you to properly care for your discus fish. This means that the water should have an acidity level of pH 6 and it should also be soft water. These are the things that you need to remember when you are planning to keep discus fish as pets. Like air is to humans, water is the single most important aspect to fishes besides food. 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.