Discus fish are easily frightened and if they have nowhere to hide, they will get stressed easily and can possibly hurt themselves from dashing around the tank and hitting the glass. The water is also an important factor. 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. Discus Fish Disease: How to Deal with Them As a hobbyist who is currently taking care of discus fish, you have to remember that aside from knowing how to raise them, you also need to know about the diseases that may afflict them. By learning about the different kinds of diseases that may affect your discus fish, you will be able to tell if your discus fish already has the disease and also know how to treat them. After you understand the basics of keeping this kind of fish, you will see that it s quite easy to keep Discus Fish in your fish tank. First of all, you have to see to the water quality. In most cases, poor water quality is often the reason why people have difficulty in keeping Discus Fish. When it comes to water quality, try to think where the fish originated. They live and travel in groups of at least 6. So, make sure that you have at least 6 discus fish swimming around in your aquarium in order to keep them happy and prevent them from getting lonely. With more discus fish in your aquarium, they will be less prone to misbehaving. You have to keep in mind that lonely discus fish tend to be aggressive to their own kind as well as to other species of fish. Also, it is very important to be familiar with the behavior of the discus fish especially when they are mating or starting to breed. The first thing that you have to consider is the fish tank. You need to make sure that you have the right fish tank for breeding discus fish. A 20 gallon fish tank is great for breeding as this will give you enough space for both the mating pairs to swim around and breed. 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.