This means that you have to have a large aquarium in order for you to keep Discus Fish, especially if you are planning on keeping more than two. You also have to remember that if you want to keep your Discus Fish happy, you have to keep at least 6 Discus Fish together in the same aquarium. The size and shape of the fish tank is also important. Make sure that you don t place them in an area where it gets a lot of direct sunlight. Doing so will cause too much plant expansion, which will scale back the oxygen concentration inside the fish tank. You should also avoid placing the tank in areas in your home that gets too much traffic. This will simply subject your discus fish with high levels of stress, which will eventually mean that they will be more prone to sickness. 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. And one of the most sought after tropical freshwater fish today is the discus fish. A lot of discus fish owners today have seen the great potential in making money of their pets. First off, you have to realize that the discus fish is not just like your ordinary goldfish, they can be quite costly and selling their fry has the possibility of making them money. 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. Also, you should observe their behavior. If your discus fish go on food strike, it s a clear sign that they are unwell. This is to prevent them from getting lonely and also prevent them from getting aggressive against their own kind. Discus fish are shy types of fishes. This is why you also need to put some ornaments and plants inside the aquarium. These things will serve as a place to hide for your discus fish. Also, you have to remember that discus fish are quite sensitive to noise.