Here are your options: First, is to buy young discus fish, bout six to eight of them. As a fry, it is hard to determine the sex of the discus fish. So this is mostly a hit and miss affair. 3 inches would be the best size to buy them. But, the odds are that in those six to eight young discus fish, you will be able to get at least a pair or two. They live in groups in their natural habitat, which is why you need to have at least 2 or 3 pairs of breeding discus fish in the breeding tank. As for the tank itself, you have to keep it clean and simple. Never overcrowd the fish tank with ornaments. A few plants and rocks will do as it will serve as places for them to hide. However, you will find that keeping them can present you with a challenge. You have to remember that discus fish are very sensitive when it comes to the water quality they live in as well as the food you feed them. So, here are several tips that you need to remember in order to keep your discus fish happy and healthy. You have to keep in mind that unlike most freshwater aquarium fishes, discus fish needs to be taken care of properly in order for them to grow healthy and happy even if they are not in their natural habitat. These are the reasons why you need to learn about the different care tips and techniques for discus fish. Discus fish can grow up to 6 or even 7 inches. Now, because you have to have at least 6 discus fish together in the aquarium, you will definitely need a larger tank. Although it is possible for you to keep discus fish in tanks that are empty, it s best if you put in plants, bog wood, and rocks inside the tank. Many fish enthusiasts even say that beginners should not attempt to take care of this kind of fish as it will just frustrate them especially if they don t know what they are doing. Discus fish are very temperamental but if you do the necessary research and apply it in taking care of the discus fish in your aquarium, you will be able to have a discus fish that will thrive in your aquarium and also grow happy and healthy.