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. If you want to add other species of fish in the discus fish aquarium, make sure that you try adding catfish, plecs, small tetras, and other gently and slow moving fish from South America. For this kind of disease, you may want to treat the disease by increasing the water temperature from 30 degrees Celsius to 36 degrees Celsius. Keep the water temperature raised for around 8 to 10 days. By increasing the water temperature, you also need to increase water aeration to keep the oxygen level up. They are very colorful and they can also be the center attraction of your aquarium. If you did your research about Discus Fish, then you know how expensive they can be. If you are planning to buy a Discus Fish as an additional fish in to your aquarium, here are some tips that you need to remember before you actually buy one. A reverse osmosis filter will be able to strip everything from the water and this will also lower the PH level as well as the hardness. Feeding Discus Fish is not that difficult to do. If you have an adult Discus Fish, you will need to feed it 2 to 3 times a day. But, you should never over feed them as the excess food will pollute the water and it will tend to produce ammonia. For starters, you have to make sure that you keep at least six Discus Fish together. You have to remember that Discus Fish are shoaling fish, which means that you have to put them in groups. This is a great way for you to keep your pet healthy and in good spirits. You will also want to keep other varieties of fish together with the Discus Fish in order to add variety to your aquarium and make it even look more attractive. This is the surest way that you will be able to get a pair of discus fish of the opposite sex. The problem here is that if you don t know how to look at a discus fish to determine the sex, you may get duped. So only go to a trusted dealer. An adult discus fish is much more expensive because you re paying for the convenience.