Another advantage of keeping them in groups is that you are actually increasing their chances of mating and breeding and produce more discus fish, which you can keep or even sell for profit. Although discus fish are very beautiful on its own, you can increase the appeal of your discus fish aquarium by adding other species of fish. If in a cramped space, this can lead to fighting and injuries. You may add some ornaments in your tank. Although they can survive without them, ornaments wont only make your aquarium look good, but they can also provide shelter for them for their protection and for their spawning. Also, some plants can help clean the tank. Discus Fish will establish territory within the aquarium and you will see them defending it against the other fish in the tank. This means that they are getting ready to breed. You have to keep an eye on the mating pair as you will need to move them in to the breeding tank. In order for the breeding to be successful, you have to get a separate tank for the breeding pair. You also need to make sure that the detritus is removed on a daily basis along with any uneaten food as this will produce ammonia in the water, which will potentially make the Discus Fish ill or possibly kill it. The PH level of the water is also very important. Because Discus Fish thrives on a more acidic type of water, you have to keep the water PH level between 5.5 and 6.8. But, if you want to have an aquarium full of discus fish and want to save money in doing so, then you would just have to breed them yourself. Breeding discus fish is not as hard as you may think; it s not as simple either. There certainly will be some costs, but if you do it right, you will be saving money in the long run. Water chemistry is one of the most important factors that you need to understand when you plan on raising discus fish. With proper water chemistry, you can be sure that you will be able to keep your discus fish healthy as well as happy. As a discus fish owner, you need to understand that you should test the water prior to every water change.