Welcome to our forum.
If you're new to the hobby, raising Discus is about the most challenging thing you can do. In fact, many experienced aquarists avoid them because they're expensive, demanding and delicate. Achintya has been very successful raising Discus, but as he said, they require a high quality environment. In addition, they seem to do better in larger groups. A 30 gallon tank is probably the minimum size for two adults; a larger group requires a very large aquarium. That said, a Discus aquarium can be quite beautiful and very much admired by other aquarists.
A search button is at the top of the page and will lead to some information about the nitrogen cycle. It's very important to cycle a new aquarium, because few species of fish can live in an uncycled tank. If you have more questions, just ask.
