This is quite advantageous and will make it easier for you to maintain the quality of water but they are not really considered as a necessity. You have to remember that reverse osmosis filtration unit cost a lot of money. And, if you are just starting out raising discus fish, you will see that the price of this kind of filter is enough reason not to put one in your tank. If the temperature and the acidic level falls, there will be a good chance that your discus fish will not breed and in certain cases, they can even die. As with any fish, your tank should be kept clean at all times. No creature would like to live in a dump. If you notice that your tank s water is getting dirty, you should change it. Although discus fish are not that sensitive to water hardness, it will play an important role in keeping them healthy. The optimum hardness of water for discus fish to thrive in should be between 1dH and 8dH. This will be quite soft, which is perfect for discus fish to live in. Remember these tips and you can be sure that you will be able to get your discus fish to thrive in your aquarium. Some would disagree saying that there are others more beautiful but that is just a matter of opinion, an opinion that millions of aquarium owners have made by owning a discus fish today. This mesmerizing fish though comes with a hefty price tag. Some sellers have been found to be selling their discus fish in the northern region of 250 dollars. There are still quite a few things that you have to do to ensure that they will live a long time and save you the anxiety of having to buy new fish every time. The big news is, most fishes, including the discus fish, maybe even more so, develop health conditions because of stress. Although fishes are fragile as compared to other household pets, they don t really just die and wither if they are kept well. Some people may find keeping discus fish very difficult while some find it easy, but it s all about discovering these secrets which spell the difference, and one of the biggest secrets is the environment which the discus fish lives in. First off, you need to know that the discus fish has a shy character.